Attachment 347366 Details for Bug 188521 – Patch for landing

[patch] Patch for landing

bug-188521-20180817103604.patch (text/plain), 70.45 KB, created by Eric Carlson on 2018-08-17 10:36:05 PDT

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Creator: Eric Carlson

Created: 2018-08-17 10:36:05 PDT

Size: 70.45 KB

patch

obsolete

>Subversion Revision: 234888
>diff --git a/Source/WebCore/ChangeLog b/Source/WebCore/ChangeLog
>index c052c632521fffed7f6a1b9181d118bdd56bcd27..6851c86d2acdce34f7d116d18fe5c05429bd8304 100644
>--- a/Source/WebCore/ChangeLog
>+++ b/Source/WebCore/ChangeLog
>@@ -1,3 +1,67 @@
>+2018-08-15  Eric Carlson  <eric.carlson@apple.com>
>+
>+        [MediaStream] Move capture device monitoring to WebKit
>+        https://bugs.webkit.org/show_bug.cgi?id=188521
>+        <rdar://problem/43251787>
>+
>+        Reviewed by Youenn Fablet.
>+
>+        No new tests, updated fast/mediastream/device-change-event-2.html for the changes.
>+
>+        * Modules/mediastream/MediaDevices.cpp:
>+        (WebCore::MediaDevices::MediaDevices): Device change listener is added in addEventListener.
>+        (WebCore::MediaDevices::stop): Device change listener is on the user media controller.
>+        (WebCore::MediaDevices::addEventListener): Add the device change listener only once the first
>+        event handler is added.
>+        * Modules/mediastream/MediaDevices.h:
>+
>+        * Modules/mediastream/UserMediaClient.h:
>+        * Modules/mediastream/UserMediaController.h:
>+        (WebCore::UserMediaController::addDeviceChangeObserver): Pass through to the client.
>+        (WebCore::UserMediaController::removeDeviceChangeObserver): Ditto.
>+
>+        * platform/mediastream/CaptureDeviceManager.cpp:
>+        (CaptureDeviceManager::deviceChanged): Notify RealtimeMediaSourceCenter.
>+        (nextObserverToken): Deleted.
>+        (CaptureDeviceManager::addCaptureDeviceChangedObserver): Deleted.
>+        (CaptureDeviceManager::removeCaptureDeviceChangedObserver): Deleted.
>+        * platform/mediastream/CaptureDeviceManager.h:
>+
>+        * platform/mediastream/RealtimeMediaSourceCenter.cpp:
>+        (WebCore::RealtimeMediaSourceCenter::setDevicesChangedObserver):
>+        (WebCore::RealtimeMediaSourceCenter::captureDevicesChanged):
>+        (WebCore::observerMap): Deleted.
>+        (WebCore::RealtimeMediaSourceCenter::addDevicesChangedObserver): Deleted.
>+        (WebCore::RealtimeMediaSourceCenter::removeDevicesChangedObserver): Deleted.
>+        * platform/mediastream/RealtimeMediaSourceCenter.h:
>+
>+        * platform/mediastream/ios/AVAudioSessionCaptureDeviceManager.mm:
>+        (WebCore::AVAudioSessionCaptureDeviceManager::refreshAudioCaptureDevices): Call base class.
>+
>+        * platform/mediastream/mac/AVCaptureDeviceManager.mm:
>+        (WebCore::AVCaptureDeviceManager::deviceConnected): Ditto.
>+        (WebCore::AVCaptureDeviceManager::deviceDisconnected): Ditto.
>+
>+        * platform/mediastream/mac/CoreAudioCaptureDeviceManager.cpp:
>+        (WebCore::deviceHasInputStreams): Drive-by fix, check the number of buffers to see if the
>+        device has input streams.
>+        (WebCore::CoreAudioCaptureDeviceManager::coreAudioCaptureDevices): Use new bool parameter
>+        added to refreshAudioCaptureDevices so we won't trigger a device change event on the first scan.
>+        (WebCore::CoreAudioCaptureDeviceManager::refreshAudioCaptureDevices): Add param.
>+        (WebCore::CoreAudioCaptureDeviceManager::devicesChanged): Use new param.
>+        * platform/mediastream/mac/CoreAudioCaptureDeviceManager.h:
>+
>+        * platform/mock/MockRealtimeMediaSourceCenter.cpp:
>+        (WebCore::MockRealtimeMediaSourceCenter::setDevices): Don't need to call captureDevicesChanged,
>+        it is done in the UI process.
>+        (WebCore::MockRealtimeMediaSourceCenter::addDevice): Ditto.
>+        (WebCore::MockRealtimeMediaSourceCenter::removeDevice): Ditto.
>+
>+        * testing/InternalSettings.cpp:
>+        (WebCore::InternalSettings::setPageIsFocusedAndActive): New, used by updated test.
>+        * testing/Internals.h:
>+        * testing/Internals.idl:
>+
> 2018-08-15  Wenson Hsieh  <wenson_hsieh@apple.com>
> 
>         [Attachment SPI] Remove attachment display mode options
>diff --git a/Source/WebKit/ChangeLog b/Source/WebKit/ChangeLog
>index 65b78a253c9de6d06d570c6bdfef158d67ac774b..17058f3cc77d963061bbd23eb393067b4b377a6a 100644
>--- a/Source/WebKit/ChangeLog
>+++ b/Source/WebKit/ChangeLog
>@@ -1,3 +1,57 @@
>+2018-08-15  Eric Carlson  <eric.carlson@apple.com>
>+
>+        [MediaStream] Move capture device monitoring to WebKit
>+        https://bugs.webkit.org/show_bug.cgi?id=188521
>+        <rdar://problem/43251787>
>+
>+        Reviewed by Youenn Fablet.
>+
>+        * UIProcess/UserMediaPermissionRequestManagerProxy.cpp:
>+        (WebKit::UserMediaPermissionRequestManagerProxy::captureDevicesChanged): Notify as appropriate.
>+        (WebKit::UserMediaPermissionRequestManagerProxy::viewIsBecomingVisible): Change name from
>+        viewIsBecomingVisible. Call captureDevicesChanged if a change happened when not visible.
>+        (WebKit::UserMediaPermissionRequestManagerProxy::watchdogTimerFired): Clear m_pendingDeviceChangeEvent.
>+        (WebKit::UserMediaPermissionRequestManagerProxy::processPregrantedRequests): Deleted.
>+        * UIProcess/UserMediaPermissionRequestManagerProxy.h:
>+
>+        * UIProcess/UserMediaProcessManager.cpp:
>+        (WebKit::UserMediaProcessManager::UserMediaProcessManager): Initialize timer.
>+        (WebKit::UserMediaProcessManager::captureDevicesChanged): New, notify each manager.
>+        (WebKit::UserMediaProcessManager::beginMonitoringCaptureDevices): Cache the device list and 
>+        register device change listener the first time it is called.
>+        * UIProcess/UserMediaProcessManager.h:
>+
>+        * UIProcess/WebPageProxy.cpp:
>+        (WebKit::WebPageProxy::viewIsBecomingVisible):
>+        (WebKit::WebPageProxy::beginMonitoringCaptureDevices):
>+        * UIProcess/WebPageProxy.h:
>+        * UIProcess/WebPageProxy.messages.in:
>+
>+        * WebProcess/MediaStream/UserMediaPermissionRequestManager.cpp:
>+        (WebKit::UserMediaPermissionRequestManager::addDeviceChangeObserver): Add listener, tell page
>+        to start monitoring device changes.
>+        (WebKit::UserMediaPermissionRequestManager::removeDeviceChangeObserver): Remove listener.
>+        (WebKit::UserMediaPermissionRequestManager::captureDevicesChanged): Call listeners.
>+        * WebProcess/MediaStream/UserMediaPermissionRequestManager.h:
>+
>+        * WebProcess/WebCoreSupport/WebUserMediaClient.cpp:
>+        (WebKit::WebUserMediaClient::addDeviceChangeObserver):
>+        (WebKit::WebUserMediaClient::removeDeviceChangeObserver):
>+        * WebProcess/WebCoreSupport/WebUserMediaClient.h:
>+
>+        * WebProcess/WebPage/WebPage.cpp:
>+        (WebKit::WebPage::captureDevicesChanged):
>+        * WebProcess/WebPage/WebPage.h:
>+        * WebProcess/WebPage/WebPage.messages.in:
>+
>+        * WebProcess/WebProcess.cpp:
>+        (WebKit::WebProcess::addMockMediaDevice):
>+        (WebKit::WebProcess::clearMockMediaDevices):
>+        (WebKit::WebProcess::removeMockMediaDevice):
>+        (WebKit::WebProcess::resetMockMediaDevices):
>+        (WebKit::WebProcess::captureDevicesChanged):
>+        * WebProcess/WebProcess.h:
>+
> 2018-08-15  Michael Catanzaro  <mcatanzaro@igalia.com>
> 
>         [WPE][GTK] WaylandCompositor fails to properly remove surface from its page map
>diff --git a/Source/WebCore/Modules/mediastream/MediaDevices.cpp b/Source/WebCore/Modules/mediastream/MediaDevices.cpp
>index be9051c93994d5bbc10a0d8aa69419b1714aeeab..6e5a9aa7fec504dcdfe61b44357a451c7edf5615 100644
>--- a/Source/WebCore/Modules/mediastream/MediaDevices.cpp
>+++ b/Source/WebCore/Modules/mediastream/MediaDevices.cpp
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2015 Ericsson AB. All rights reserved.
>- * Copyright (C) 2015-2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2015-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -41,6 +41,7 @@
> #include "MediaTrackSupportedConstraints.h"
> #include "RealtimeMediaSourceSettings.h"
> #include "RuntimeEnabledFeatures.h"
>+#include "UserMediaController.h"
> #include "UserMediaRequest.h"
> #include <wtf/RandomNumber.h>
> 
>@@ -51,17 +52,6 @@ inline MediaDevices::MediaDevices(Document& document)
>     , m_scheduledEventTimer(*this, &MediaDevices::scheduledEventTimerFired)
>     , m_eventNames(eventNames())
> {
>-    m_deviceChangedToken = RealtimeMediaSourceCenter::singleton().addDevicesChangedObserver([weakThis = makeWeakPtr(*this), this]() {
>-
>-        if (!weakThis)
>-            return;
>-
>-        // FIXME: We should only dispatch an event if the user has been granted access to the type of
>-        // device that was added or removed.
>-        if (!m_scheduledEventTimer.isActive())
>-            m_scheduledEventTimer.startOneShot(Seconds(randomNumber() / 2));
>-    });
>-
>     suspendIfNeeded();
> 
>     static_assert(static_cast<size_t>(MediaDevices::DisplayCaptureSurfaceType::Monitor) == static_cast<size_t>(RealtimeMediaSourceSettings::DisplaySurfaceType::Monitor), "MediaDevices::DisplayCaptureSurfaceType::Monitor is not equal to RealtimeMediaSourceSettings::DisplaySurfaceType::Monitor as expected");
>@@ -74,8 +64,12 @@ MediaDevices::~MediaDevices() = default;
> 
> void MediaDevices::stop()
> {
>-    if (m_deviceChangedToken)
>-        RealtimeMediaSourceCenter::singleton().removeDevicesChangedObserver(m_deviceChangedToken);
>+    if (m_deviceChangeToken) {
>+        auto* document = this->document();
>+        auto* controller = document ? UserMediaController::from(document->page()) : nullptr;
>+        if (document && controller)
>+            controller->removeDeviceChangeObserver(m_deviceChangeToken);
>+    }
> }
> 
> Ref<MediaDevices> MediaDevices::create(Document& document)
>@@ -181,6 +175,27 @@ bool MediaDevices::canSuspendForDocumentSuspension() const
>     return true;
> }
> 
>+bool MediaDevices::addEventListener(const AtomicString& eventType, Ref<EventListener>&& listener, const AddEventListenerOptions& options)
>+{
>+    if (!m_listeningForDeviceChanges && eventType == eventNames().devicechangeEvent) {
>+        auto* document = this->document();
>+        auto* controller = document ? UserMediaController::from(document->page()) : nullptr;
>+        if (document && controller) {
>+            m_listeningForDeviceChanges = true;
>+
>+            m_deviceChangeToken = controller->addDeviceChangeObserver([weakThis = makeWeakPtr(*this), this]() {
>+
>+                if (!weakThis || m_scheduledEventTimer.isActive())
>+                    return;
>+
>+                m_scheduledEventTimer.startOneShot(Seconds(randomNumber() / 2));
>+            });
>+        }
>+    }
>+
>+    return EventTargetWithInlineData::addEventListener(eventType, WTFMove(listener), options);
>+}
>+
> } // namespace WebCore
> 
> #endif // ENABLE(MEDIA_STREAM)
>diff --git a/Source/WebCore/Modules/mediastream/MediaDevices.h b/Source/WebCore/Modules/mediastream/MediaDevices.h
>index 02d1aef9d6f317867a97f195be90614859549cf5..072ba15d496e3a6b872f109a963582d2f200d94c 100644
>--- a/Source/WebCore/Modules/mediastream/MediaDevices.h
>+++ b/Source/WebCore/Modules/mediastream/MediaDevices.h
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2015 Ericsson AB. All rights reserved.
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -41,11 +41,11 @@
> #include "MediaTrackConstraints.h"
> #include "RealtimeMediaSourceCenter.h"
> #include "Timer.h"
>+#include "UserMediaClient.h"
> #include <wtf/WeakPtr.h>
> 
> namespace WebCore {
> 
>-class Document;
> class MediaDeviceInfo;
> class MediaStream;
> 
>@@ -85,6 +85,7 @@ private:
>     explicit MediaDevices(Document&);
> 
>     void scheduledEventTimerFired();
>+    bool addEventListener(const AtomicString& eventType, Ref<EventListener>&&, const AddEventListenerOptions&) override;
> 
>     friend class JSMediaDevicesOwner;
> 
>@@ -101,8 +102,9 @@ private:
>     void derefEventTarget() final { deref(); }
> 
>     Timer m_scheduledEventTimer;
>-    RealtimeMediaSourceCenter::DevicesChangedObserverToken m_deviceChangedToken;
>+    UserMediaClient::DeviceChangeObserverToken m_deviceChangeToken;
>     const EventNames& m_eventNames; // Need to cache this so we can use it from GC threads.
>+    bool m_listeningForDeviceChanges { false };
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/Modules/mediastream/UserMediaClient.h b/Source/WebCore/Modules/mediastream/UserMediaClient.h
>index 3e3ade1a8c2bd5ea70c027632d760e3a01737dbf..b2aa5603f575127e5f5a8646a9a877e214a4a618 100644
>--- a/Source/WebCore/Modules/mediastream/UserMediaClient.h
>+++ b/Source/WebCore/Modules/mediastream/UserMediaClient.h
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2011 Ericsson AB. All rights reserved.
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -33,6 +33,8 @@
> 
> #if ENABLE(MEDIA_STREAM)
> 
>+#include <wtf/ObjectIdentifier.h>
>+
> namespace WebCore {
> 
> class MediaDevicesEnumerationRequest;
>@@ -49,6 +51,11 @@ public:
>     virtual void enumerateMediaDevices(MediaDevicesEnumerationRequest&) = 0;
>     virtual void cancelMediaDevicesEnumerationRequest(MediaDevicesEnumerationRequest&) = 0;
> 
>+    enum DeviceChangeObserverTokenType { };
>+    using DeviceChangeObserverToken = ObjectIdentifier<DeviceChangeObserverTokenType>;
>+    virtual DeviceChangeObserverToken addDeviceChangeObserver(WTF::Function<void()>&&) = 0;
>+    virtual void removeDeviceChangeObserver(DeviceChangeObserverToken) = 0;
>+
> protected:
>     virtual ~UserMediaClient() = default;
> };
>diff --git a/Source/WebCore/Modules/mediastream/UserMediaController.h b/Source/WebCore/Modules/mediastream/UserMediaController.h
>index 2249abf2786bd2235c40188c4ac44aa187d62bf5..cfac599d7fbe34bd50404849165e53fbb3a5b1b1 100644
>--- a/Source/WebCore/Modules/mediastream/UserMediaController.h
>+++ b/Source/WebCore/Modules/mediastream/UserMediaController.h
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2012 Google Inc. All rights reserved.
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -48,6 +48,9 @@ public:
>     void enumerateMediaDevices(MediaDevicesEnumerationRequest&);
>     void cancelMediaDevicesEnumerationRequest(MediaDevicesEnumerationRequest&);
> 
>+    UserMediaClient::DeviceChangeObserverToken addDeviceChangeObserver(WTF::Function<void()>&&);
>+    void removeDeviceChangeObserver(UserMediaClient::DeviceChangeObserverToken);
>+
>     WEBCORE_EXPORT static const char* supplementName();
>     static UserMediaController* from(Page* page) { return static_cast<UserMediaController*>(Supplement<Page>::from(page, supplementName())); }
> 
>@@ -75,6 +78,16 @@ inline void UserMediaController::cancelMediaDevicesEnumerationRequest(MediaDevic
>     m_client->cancelMediaDevicesEnumerationRequest(request);
> }
> 
>+inline UserMediaClient::DeviceChangeObserverToken UserMediaController::addDeviceChangeObserver(WTF::Function<void()>&& observer)
>+{
>+    return m_client->addDeviceChangeObserver(WTFMove(observer));
>+}
>+
>+inline void UserMediaController::removeDeviceChangeObserver(UserMediaClient::DeviceChangeObserverToken token)
>+{
>+    m_client->removeDeviceChangeObserver(token);
>+}
>+
> } // namespace WebCore
> 
> #endif // ENABLE(MEDIA_STREAM)
>diff --git a/Source/WebCore/page/Page.h b/Source/WebCore/page/Page.h
>index 654205aed7988630ab83bd50ff8784ef75bf4dcb..0c528784b522a253761e249b26a85eb7e1f96d75 100644
>--- a/Source/WebCore/page/Page.h
>+++ b/Source/WebCore/page/Page.h
>@@ -434,8 +434,8 @@ public:
>     void setIsRestoringCachedPage(bool value) { m_isRestoringCachedPage = value; }
>     bool isRestoringCachedPage() const { return m_isRestoringCachedPage; }
> 
>-    void addActivityStateChangeObserver(ActivityStateChangeObserver&);
>-    void removeActivityStateChangeObserver(ActivityStateChangeObserver&);
>+    WEBCORE_EXPORT void addActivityStateChangeObserver(ActivityStateChangeObserver&);
>+    WEBCORE_EXPORT void removeActivityStateChangeObserver(ActivityStateChangeObserver&);
> 
>     WEBCORE_EXPORT void suspendScriptedAnimations();
>     WEBCORE_EXPORT void resumeScriptedAnimations();
>diff --git a/Source/WebCore/platform/mediastream/CaptureDeviceManager.cpp b/Source/WebCore/platform/mediastream/CaptureDeviceManager.cpp
>index cd147a02b4cd7c0e8127f97ac039865a4f6728ed..8a39b292f938acd4905902a45ac4af8a87550cc0 100644
>--- a/Source/WebCore/platform/mediastream/CaptureDeviceManager.cpp
>+++ b/Source/WebCore/platform/mediastream/CaptureDeviceManager.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2015-2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2015-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -50,24 +50,14 @@ CaptureDevice CaptureDeviceManager::captureDeviceFromPersistentID(const String&
>     return { };
> }
> 
>-static CaptureDeviceManager::ObserverToken nextObserverToken()
>+void CaptureDeviceManager::deviceChanged()
> {
>-    static CaptureDeviceManager::ObserverToken nextToken = 0;
>-    return ++nextToken;
>-}
>-
>-CaptureDeviceManager::ObserverToken CaptureDeviceManager::addCaptureDeviceChangedObserver(CaptureDeviceChangedCallback&& observer)
>-{
>-    auto token = nextObserverToken();
>-    m_observers.set(token, WTFMove(observer));
>-    return token;
>-}
>+    callOnMainThread([weakThis = makeWeakPtr(*this)] {
>+        if (!weakThis)
>+            return;
> 
>-void CaptureDeviceManager::removeCaptureDeviceChangedObserver(ObserverToken token)
>-{
>-    ASSERT(m_observers.contains(token));
>-    m_observers.remove(token);
>+        RealtimeMediaSourceCenter::singleton().captureDevicesChanged();
>+    });
> }
> 
>-
> #endif // ENABLE(MEDIA_STREAM)
>diff --git a/Source/WebCore/platform/mediastream/CaptureDeviceManager.h b/Source/WebCore/platform/mediastream/CaptureDeviceManager.h
>index 45edb300c3b72e877345c9f00236fd06d3549cde..5732de03deeb4fc0985a1b1a74bcbb1460fec5bd 100644
>--- a/Source/WebCore/platform/mediastream/CaptureDeviceManager.h
>+++ b/Source/WebCore/platform/mediastream/CaptureDeviceManager.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2015-2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2015-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -29,23 +29,19 @@
> 
> #include "CaptureDevice.h"
> #include "RealtimeMediaSource.h"
>+#include <wtf/WeakPtr.h>
> 
> namespace WebCore {
> 
>-class CaptureDeviceManager {
>+class CaptureDeviceManager : public CanMakeWeakPtr<CaptureDeviceManager> {
> public:
>-    using CaptureDeviceChangedCallback = WTF::Function<void()>;
>-    using ObserverToken = uint32_t;
>-    virtual ObserverToken addCaptureDeviceChangedObserver(CaptureDeviceChangedCallback&&);
>-    virtual void removeCaptureDeviceChangedObserver(ObserverToken);
>-
>     virtual const Vector<CaptureDevice>& captureDevices() = 0;
>     virtual std::optional<CaptureDevice> captureDeviceWithPersistentID(CaptureDevice::DeviceType, const String&) { return std::nullopt; }
> 
> protected:
>     virtual ~CaptureDeviceManager();
>     CaptureDevice captureDeviceFromPersistentID(const String& captureDeviceID);
>-    HashMap<ObserverToken, CaptureDeviceChangedCallback> m_observers;
>+    void deviceChanged();
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp b/Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp
>index bfe4d6de1c8340682a1f7ee29e8c94585fe0bce8..8a4609a2d2647410689bf402a2c1d634612c7fd1 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp
>+++ b/Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp
>@@ -286,7 +286,7 @@ bool RealtimeMediaSource::supportsSizeAndFrameRate(std::optional<IntConstraint>
>             badConstraint = frameRateConstraint->name();
>         return false;
>     }
>-    
>+
>     return true;
> }
> 
>@@ -754,7 +754,7 @@ bool RealtimeMediaSource::supportsConstraint(const MediaConstraint& constraint)
>         // Unknown (or unsupported) constraints should be ignored.
>         break;
>     }
>-    
>+
>     return false;
> }
> 
>@@ -765,7 +765,7 @@ bool RealtimeMediaSource::supportsConstraints(const MediaConstraints& constraint
>     FlattenedConstraint candidates;
>     if (!selectSettings(constraints, candidates, invalidConstraint, SelectType::ForSupportsConstraints))
>         return false;
>-    
>+
>     return true;
> }
> 
>diff --git a/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.cpp b/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.cpp
>index 3886ff875ce89f5c108c437bb9caa2f4d7f1602a..ffd51d4e46d5e8aaa2a23a062aa124f852f3fc46 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.cpp
>+++ b/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.cpp
>@@ -1,7 +1,7 @@
> /*
>  * Copyright (C) 2011 Ericsson AB. All rights reserved.
>  * Copyright (C) 2012 Google Inc. All rights reserved.
>- * Copyright (C) 2013-2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2013-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -53,12 +53,6 @@ static RealtimeMediaSourceCenter*& mediaStreamCenterOverride()
>     return override;
> }
> 
>-static HashMap<unsigned, std::function<void()>>& observerMap()
>-{
>-    static NeverDestroyed<HashMap<unsigned, std::function<void()>>> map;
>-    return map;
>-}
>-
> RealtimeMediaSourceCenter& RealtimeMediaSourceCenter::singleton()
> {
>     RealtimeMediaSourceCenter* override = mediaStreamCenterOverride();
>@@ -199,25 +193,18 @@ ExceptionOr<void> RealtimeMediaSourceCenter::setDeviceEnabled(const String& id,
>     return Exception { NotFoundError };
> }
> 
>-RealtimeMediaSourceCenter::DevicesChangedObserverToken RealtimeMediaSourceCenter::addDevicesChangedObserver(std::function<void()>&& observer)
>-{
>-    static DevicesChangedObserverToken nextToken = 0;
>-    observerMap().set(++nextToken, WTFMove(observer));
>-    return nextToken;
>-}
>-
>-void RealtimeMediaSourceCenter::removeDevicesChangedObserver(DevicesChangedObserverToken token)
>+void RealtimeMediaSourceCenter::setDevicesChangedObserver(std::function<void()>&& observer)
> {
>-    bool wasRemoved = observerMap().remove(token);
>-    ASSERT_UNUSED(wasRemoved, wasRemoved);
>+    ASSERT(isMainThread());
>+    ASSERT(!m_deviceChangedObserver);
>+    m_deviceChangedObserver = WTFMove(observer);
> }
> 
> void RealtimeMediaSourceCenter::captureDevicesChanged()
> {
>-    // Copy the hash map because the observer callback may call back in and modify the map.
>-    auto callbacks = observerMap();
>-    for (auto& it : callbacks)
>-        it.value();
>+    ASSERT(isMainThread());
>+    if (m_deviceChangedObserver)
>+        m_deviceChangedObserver();
> }
> 
> void RealtimeMediaSourceCenter::validateRequestConstraints(ValidConstraintsHandler&& validHandler, InvalidConstraintsHandler&& invalidHandler, const MediaStreamRequest& request, String&& deviceIdentifierHashSalt)
>diff --git a/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.h b/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.h
>index ef7b3cfcd916edccae620e4421f8c0babe8fe3ec..d54ae8e7fa57d32571e0730cd629775488dfcf61 100644
>--- a/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.h
>+++ b/Source/WebCore/platform/mediastream/RealtimeMediaSourceCenter.h
>@@ -1,7 +1,7 @@
> /*
>  * Copyright (C) 2011 Ericsson AB. All rights reserved.
>  * Copyright (C) 2012 Google Inc. All rights reserved.
>- * Copyright (C) 2013-2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2013-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -85,22 +85,22 @@ public:
>     WEBCORE_EXPORT CaptureDevice captureDeviceWithUniqueID(const String& id, const String& hashSalt);
>     WEBCORE_EXPORT ExceptionOr<void> setDeviceEnabled(const String&, bool);
> 
>-    using DevicesChangedObserverToken = unsigned;
>-    DevicesChangedObserverToken addDevicesChangedObserver(std::function<void()>&&);
>-    void removeDevicesChangedObserver(DevicesChangedObserverToken);
>+    WEBCORE_EXPORT void setDevicesChangedObserver(std::function<void()>&&);
> 
>     void setVideoCapturePageState(bool, bool);
> 
>+    void captureDevicesChanged();
>+
> protected:
>     RealtimeMediaSourceCenter();
> 
>-    void captureDevicesChanged();
>-
>     static RealtimeMediaSourceCenter& platformCenter();
>     RealtimeMediaSourceSupportedConstraints m_supportedConstraints;
> 
>     CaptureDeviceManager* m_audioCaptureDeviceManager { nullptr };
>     CaptureDeviceManager* m_videoCaptureDeviceManager { nullptr };
>+
>+    WTF::Function<void()> m_deviceChangedObserver;
> };
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/platform/mediastream/ios/AVAudioSessionCaptureDeviceManager.mm b/Source/WebCore/platform/mediastream/ios/AVAudioSessionCaptureDeviceManager.mm
>index 32e70e16dca306f5fd790d2e34515781f7776f4e..f61d8dfaf623b6400ed8547cc778d6f58d33c933 100644
>--- a/Source/WebCore/platform/mediastream/ios/AVAudioSessionCaptureDeviceManager.mm
>+++ b/Source/WebCore/platform/mediastream/ios/AVAudioSessionCaptureDeviceManager.mm
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -29,6 +29,7 @@
> #if ENABLE(MEDIA_STREAM) && PLATFORM(IOS)
> 
> #include "AVAudioSessionCaptureDevice.h"
>+#include "RealtimeMediaSourceCenter.h"
> #include <AVFoundation/AVAudioSession.h>
> #include <wtf/SoftLinking.h>
> #include <wtf/Vector.h>
>@@ -141,8 +142,7 @@ void AVAudioSessionCaptureDeviceManager::refreshAudioCaptureDevices()
>     m_audioSessionCaptureDevices = WTFMove(newAudioDevices);
>     m_devices = WTFMove(newDevices);
> 
>-    for (auto& observer : m_observers.values())
>-        observer();
>+    deviceChanged();
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/platform/mediastream/mac/AVCaptureDeviceManager.mm b/Source/WebCore/platform/mediastream/mac/AVCaptureDeviceManager.mm
>index c011b26e686b05c1fa0b69a0d91d7cf0ca63f340..0efc92a0fee902ad9689e6ceacc55a6572f4fbd9 100644
>--- a/Source/WebCore/platform/mediastream/mac/AVCaptureDeviceManager.mm
>+++ b/Source/WebCore/platform/mediastream/mac/AVCaptureDeviceManager.mm
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2013-2015 Apple Inc. All rights reserved.
>+ * Copyright (C) 2013-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -179,9 +179,7 @@ void AVCaptureDeviceManager::registerForDeviceNotifications()
> void AVCaptureDeviceManager::deviceConnected()
> {
>     refreshCaptureDevices();
>-
>-    for (auto& observer : m_observers.values())
>-        observer();
>+    deviceChanged();
> }
> 
> void AVCaptureDeviceManager::deviceDisconnected(AVCaptureDeviceTypedef* device)
>@@ -200,8 +198,7 @@ void AVCaptureDeviceManager::deviceDisconnected(AVCaptureDeviceTypedef* device)
>         }
>     }
> 
>-    for (auto& observer : m_observers.values())
>-        observer();
>+    deviceChanged();
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureDeviceManager.cpp b/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureDeviceManager.cpp
>index 5413a8f86722204e4c42fae6eedb306a52f551a8..1111eab0320f41be16b308fb70843443bef4e941 100644
>--- a/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureDeviceManager.cpp
>+++ b/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureDeviceManager.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -30,6 +30,7 @@
> 
> #include "CoreAudioCaptureDevice.h"
> #include "Logging.h"
>+#include "RealtimeMediaSourceCenter.h"
> #include <AudioUnit/AudioUnit.h>
> #include <CoreMedia/CMSync.h>
> #include <wtf/Assertions.h>
>@@ -64,10 +65,17 @@ std::optional<CaptureDevice> CoreAudioCaptureDeviceManager::captureDeviceWithPer
> static bool deviceHasInputStreams(AudioObjectID deviceID)
> {
>     UInt32 dataSize = 0;
>-    AudioObjectPropertyAddress address = { kAudioDevicePropertyStreams, kAudioDevicePropertyScopeInput, kAudioObjectPropertyElementMaster };
>+    AudioObjectPropertyAddress address = { kAudioDevicePropertyStreamConfiguration, kAudioDevicePropertyScopeInput, kAudioObjectPropertyElementMaster };
>     auto err = AudioObjectGetPropertyDataSize(deviceID, &address, 0, nullptr, &dataSize);
> 
>-    return !err && dataSize;
>+    if (err || !dataSize)
>+        return false;
>+
>+    auto bufferList = std::unique_ptr<AudioBufferList>((AudioBufferList*) ::operator new (dataSize));
>+    memset(bufferList.get(), 0, dataSize);
>+    err = AudioObjectGetPropertyData(deviceID, &address, 0, nullptr, &dataSize, bufferList.get());
>+
>+    return !err && bufferList->mNumberBuffers;
> }
> 
> static bool isValidCaptureDevice(const CoreAudioCaptureDevice& device)
>@@ -81,7 +89,7 @@ Vector<CoreAudioCaptureDevice>& CoreAudioCaptureDeviceManager::coreAudioCaptureD
>     static bool initialized;
>     if (!initialized) {
>         initialized = true;
>-        refreshAudioCaptureDevices();
>+        refreshAudioCaptureDevices(DoNotNotify);
> 
>         AudioObjectPropertyAddress address = { kAudioHardwarePropertyDevices, kAudioObjectPropertyScopeGlobal, kAudioObjectPropertyElementMaster };
>         auto err = AudioObjectAddPropertyListener(kAudioObjectSystemObject, &address, devicesChanged, this);
>@@ -102,7 +110,7 @@ std::optional<CoreAudioCaptureDevice> CoreAudioCaptureDeviceManager::coreAudioDe
> }
> 
> 
>-void CoreAudioCaptureDeviceManager::refreshAudioCaptureDevices()
>+void CoreAudioCaptureDeviceManager::refreshAudioCaptureDevices(NotifyIfDevicesHaveChanged notify)
> {
>     AudioObjectPropertyAddress address = { kAudioHardwarePropertyDevices, kAudioObjectPropertyScopeGlobal, kAudioObjectPropertyElementMaster };
>     UInt32 dataSize = 0;
>@@ -156,13 +164,13 @@ void CoreAudioCaptureDeviceManager::refreshAudioCaptureDevices()
>         m_devices.append(captureDevice);
>     }
> 
>-    for (auto& observer : m_observers.values())
>-        observer();
>+    if (notify == Notify)
>+        deviceChanged();
> }
> 
> OSStatus CoreAudioCaptureDeviceManager::devicesChanged(AudioObjectID, UInt32, const AudioObjectPropertyAddress*, void* userData)
> {
>-    static_cast<CoreAudioCaptureDeviceManager*>(userData)->refreshAudioCaptureDevices();
>+    static_cast<CoreAudioCaptureDeviceManager*>(userData)->refreshAudioCaptureDevices(Notify);
>     return 0;
> }
> 
>diff --git a/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureDeviceManager.h b/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureDeviceManager.h
>index 8c28e827984caff486a45541905510375a45902d..cf48276414b242aafa486d9250375c8814cc1b9f 100644
>--- a/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureDeviceManager.h
>+++ b/Source/WebCore/platform/mediastream/mac/CoreAudioCaptureDeviceManager.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2017-2018 Apple Inc. All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>@@ -55,7 +55,8 @@ private:
>     static OSStatus devicesChanged(AudioObjectID, UInt32, const AudioObjectPropertyAddress*, void*);
>     Vector<CoreAudioCaptureDevice>& coreAudioCaptureDevices();
> 
>-    void refreshAudioCaptureDevices();
>+    enum NotifyIfDevicesHaveChanged { Notify, DoNotNotify };
>+    void refreshAudioCaptureDevices(NotifyIfDevicesHaveChanged);
> 
>     Vector<CaptureDevice> m_devices;
>     Vector<CoreAudioCaptureDevice> m_coreAudioCaptureDevices;
>diff --git a/Source/WebCore/platform/mock/MockRealtimeMediaSource.cpp b/Source/WebCore/platform/mock/MockRealtimeMediaSource.cpp
>index 0875497a1efa110453f8e2d6e523dab3617c94af..ec441efd75e9387676655bd025d937b5387737a3 100644
>--- a/Source/WebCore/platform/mock/MockRealtimeMediaSource.cpp
>+++ b/Source/WebCore/platform/mock/MockRealtimeMediaSource.cpp
>@@ -97,6 +97,7 @@ void MockRealtimeMediaSource::createCaptureDevice(const MockMediaDevice& device)
> void MockRealtimeMediaSource::resetDevices()
> {
>     setDevices(defaultDevices());
>+    RealtimeMediaSourceCenter::singleton().captureDevicesChanged();
> }
> 
> void MockRealtimeMediaSource::setDevices(Vector<MockMediaDevice>&& newMockDevices)
>@@ -115,6 +116,7 @@ void MockRealtimeMediaSource::setDevices(Vector<MockMediaDevice>&& newMockDevice
>         map.add(device.persistentId, device);
>         createCaptureDevice(device);
>     }
>+    RealtimeMediaSourceCenter::singleton().captureDevicesChanged();
> }
> 
> void MockRealtimeMediaSource::addDevice(const MockMediaDevice& device)
>@@ -122,6 +124,7 @@ void MockRealtimeMediaSource::addDevice(const MockMediaDevice& device)
>     devices().append(device);
>     deviceMap().set(device.persistentId, device);
>     createCaptureDevice(device);
>+    RealtimeMediaSourceCenter::singleton().captureDevicesChanged();
> }
> 
> void MockRealtimeMediaSource::removeDevice(const String& persistentId)
>@@ -140,6 +143,7 @@ void MockRealtimeMediaSource::removeDevice(const String& persistentId)
>     });
> 
>     map.remove(iterator);
>+    RealtimeMediaSourceCenter::singleton().captureDevicesChanged();
> }
> 
> std::optional<CaptureDevice> MockRealtimeMediaSource::captureDeviceWithPersistentID(CaptureDevice::DeviceType type, const String& id)
>diff --git a/Source/WebCore/platform/mock/MockRealtimeMediaSourceCenter.cpp b/Source/WebCore/platform/mock/MockRealtimeMediaSourceCenter.cpp
>index df91ebe0fe8544114a662c76e42afca7a700edac..db68821e31d2ce27d8be18dfd57e06fe3056a395 100644
>--- a/Source/WebCore/platform/mock/MockRealtimeMediaSourceCenter.cpp
>+++ b/Source/WebCore/platform/mock/MockRealtimeMediaSourceCenter.cpp
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2013 Google Inc. All rights reserved.
>- * Copyright (C) 2013 Apple Inc.  All rights reserved.
>+ * Copyright (C) 2013-2018 Apple Inc.  All rights reserved.
>  * Copyright (C) 2013 Nokia Corporation and/or its subsidiary(-ies).
>  *
>  * Redistribution and use in source and binary forms, with or without
>@@ -55,19 +55,16 @@ void MockRealtimeMediaSourceCenter::setMockRealtimeMediaSourceCenterEnabled(bool
> void MockRealtimeMediaSourceCenter::setDevices(Vector<MockMediaDevice>&& newMockDevices)
> {
>     MockRealtimeMediaSource::setDevices(WTFMove(newMockDevices));
>-    singleton().captureDevicesChanged();
> }
> 
> void MockRealtimeMediaSourceCenter::addDevice(const MockMediaDevice& device)
> {
>     MockRealtimeMediaSource::addDevice(device);
>-    singleton().captureDevicesChanged();
> }
> 
> void MockRealtimeMediaSourceCenter::removeDevice(const String& persistentId)
> {
>     MockRealtimeMediaSource::removeDevice(persistentId);
>-    singleton().captureDevicesChanged();
> }
> 
> } // namespace WebCore
>diff --git a/Source/WebCore/testing/Internals.cpp b/Source/WebCore/testing/Internals.cpp
>index 13b7b707e2738e33f810ce49ccd5a1af0bd72745..263fd4cc1aa038c8f78bc11ad34b0b0802fa278f 100644
>--- a/Source/WebCore/testing/Internals.cpp
>+++ b/Source/WebCore/testing/Internals.cpp
>@@ -4338,6 +4338,22 @@ void Internals::setPageVisibility(bool isVisible)
>     page.setActivityState(state);
> }
> 
>+void Internals::setPageIsFocusedAndActive(bool isFocusedAndActive)
>+{
>+    auto* document = contextDocument();
>+    if (!document || !document->page())
>+        return;
>+    auto& page = *document->page();
>+    auto state = page.activityState();
>+
>+    if (isFocusedAndActive)
>+        state |= (ActivityState::WindowIsActive | ActivityState::IsFocused);
>+    else
>+        state &= ~(ActivityState::WindowIsActive | ActivityState::IsFocused);
>+
>+    page.setActivityState(state);
>+}
>+
> #if ENABLE(WEB_RTC)
> void Internals::setH264HardwareEncoderAllowed(bool allowed)
> {
>diff --git a/Source/WebCore/testing/Internals.h b/Source/WebCore/testing/Internals.h
>index d0d2879ce6f6737945d57379147b6376d344646f..e1182de54d86e54f9911296b76d3d153710fd3f4 100644
>--- a/Source/WebCore/testing/Internals.h
>+++ b/Source/WebCore/testing/Internals.h
>@@ -641,6 +641,8 @@ public:
> #endif
> 
>     void setPageVisibility(bool isVisible);
>+    void setPageIsFocusedAndActive(bool);
>+
> 
> #if ENABLE(WEB_RTC)
>     void setH264HardwareEncoderAllowed(bool allowed);
>diff --git a/Source/WebCore/testing/Internals.idl b/Source/WebCore/testing/Internals.idl
>index 01148b98d9b0f8bfb454a7d7411a6f6f64c8820f..919bbdaf2d0aa71adca79979cdc8fec20c2eaff9 100644
>--- a/Source/WebCore/testing/Internals.idl
>+++ b/Source/WebCore/testing/Internals.idl
>@@ -603,6 +603,7 @@ enum CompositingPolicy {
>     [Conditional=WEBGL] void failNextGPUStatusCheck(WebGLRenderingContext context);
> 
>     void setPageVisibility(boolean isVisible);
>+    void setPageIsFocusedAndActive(boolean isFocused);
> 
>     [Conditional=WEB_RTC] void setH264HardwareEncoderAllowed(boolean allowed);
>     [Conditional=WEB_RTC] void applyRotationForOutgoingVideoSources(RTCPeerConnection connection);
>diff --git a/Source/WebKit/Scripts/webkit/messages.py b/Source/WebKit/Scripts/webkit/messages.py
>index a782baac9d45bb3c9d0b8992622faa6252aa184d..09e464fcd7160b2ee8fe2c93362026eb4b380d89 100644
>--- a/Source/WebKit/Scripts/webkit/messages.py
>+++ b/Source/WebKit/Scripts/webkit/messages.py
>@@ -419,6 +419,7 @@ def headers_for_type(type):
>         'WebCore::SelectionRect': ['"EditorState.h"'],
>         'WebKit::ActivityStateChangeID': ['"DrawingAreaInfo.h"'],
>         'WebKit::BackForwardListItemState': ['"SessionState.h"'],
>+        'WebKit::DeviceAccessState': ['"UserMediaPermissionRequestManager.h"'],
>         'WebKit::LayerHostingMode': ['"LayerTreeContext.h"'],
>         'WebKit::PageState': ['"SessionState.h"'],
>         'WebKit::WebGestureEvent': ['"WebEvent.h"'],
>diff --git a/Source/WebKit/UIProcess/UserMediaPermissionRequestManagerProxy.cpp b/Source/WebKit/UIProcess/UserMediaPermissionRequestManagerProxy.cpp
>index 3c07295f1053fc15dcc88445632905b8c3fcb96b..02b2a231e6796382aa1a400a49e78014b86efc4a 100644
>--- a/Source/WebKit/UIProcess/UserMediaPermissionRequestManagerProxy.cpp
>+++ b/Source/WebKit/UIProcess/UserMediaPermissionRequestManagerProxy.cpp
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2014 Igalia S.L.
>- * Copyright (C) 2016-2017 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  *  This library is free software; you can redistribute it and/or
>  *  modify it under the terms of the GNU Lesser General Public
>@@ -22,6 +22,7 @@
> 
> #include "APISecurityOrigin.h"
> #include "APIUIClient.h"
>+#include "UserMediaPermissionRequestManager.h"
> #include "UserMediaProcessManager.h"
> #include "WebAutomationSession.h"
> #include "WebPageMessages.h"
>@@ -77,6 +78,15 @@ void UserMediaPermissionRequestManagerProxy::stopCapture()
>     m_page.stopMediaCapture();
> }
> 
>+void UserMediaPermissionRequestManagerProxy::captureDevicesChanged()
>+{
>+#if ENABLE(MEDIA_STREAM)
>+    // FIXME: a page with persistent access should always get device change notifications.
>+    auto accessState = m_grantedRequests.isEmpty() ? DeviceAccessState::NoAccess : DeviceAccessState::SessionAccess;
>+    m_page.process().send(Messages::WebPage::CaptureDevicesChanged(accessState), m_page.pageID());
>+#endif
>+}
>+
> void UserMediaPermissionRequestManagerProxy::clearCachedState()
> {
>     invalidatePendingRequests();
>@@ -434,7 +444,7 @@ void UserMediaPermissionRequestManagerProxy::captureStateChanged(MediaProducer::
> #endif
> }
> 
>-void UserMediaPermissionRequestManagerProxy::processPregrantedRequests()
>+void UserMediaPermissionRequestManagerProxy::viewIsBecomingVisible()
> {
>     for (auto& request : m_pregrantedRequests)
>         request->allow();
>diff --git a/Source/WebKit/UIProcess/UserMediaPermissionRequestManagerProxy.h b/Source/WebKit/UIProcess/UserMediaPermissionRequestManagerProxy.h
>index 573af04d71b853957512499d92c430648bbd179f..8d3c09673c70c086c0b2b88edebf5b05bdaf6d1d 100644
>--- a/Source/WebKit/UIProcess/UserMediaPermissionRequestManagerProxy.h
>+++ b/Source/WebKit/UIProcess/UserMediaPermissionRequestManagerProxy.h
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2014 Igalia S.L.
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  *  This library is free software; you can redistribute it and/or
>  *  modify it under the terms of the GNU Lesser General Public
>@@ -50,7 +50,7 @@ public:
>     void requestUserMediaPermissionForFrame(uint64_t userMediaID, uint64_t frameID, Ref<WebCore::SecurityOrigin>&&  userMediaDocumentOrigin, Ref<WebCore::SecurityOrigin>&& topLevelDocumentOrigin, const WebCore::MediaStreamRequest&);
> 
>     void resetAccess(uint64_t mainFrameID);
>-    void processPregrantedRequests();
>+    void viewIsBecomingVisible();
> 
>     void userMediaAccessWasGranted(uint64_t, WebCore::CaptureDevice&& audioDevice, WebCore::CaptureDevice&& videoDevice);
>     void userMediaAccessWasDenied(uint64_t, UserMediaPermissionRequestProxy::UserMediaAccessDenialReason);
>@@ -61,6 +61,7 @@ public:
>     void scheduleNextRejection();
>     void rejectionTimerFired();
>     void clearCachedState();
>+    void captureDevicesChanged();
> 
>     void captureStateChanged(WebCore::MediaProducer::MediaStateFlags oldState, WebCore::MediaProducer::MediaStateFlags newState);
> 
>diff --git a/Source/WebKit/UIProcess/UserMediaProcessManager.cpp b/Source/WebKit/UIProcess/UserMediaProcessManager.cpp
>index 7ae6909746bfd7893d1ce9f309884dd3163bc4c2..7025d4d9991c59bb910025a3f480aa52bb0c39d6 100644
>--- a/Source/WebKit/UIProcess/UserMediaProcessManager.cpp
>+++ b/Source/WebKit/UIProcess/UserMediaProcessManager.cpp
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  *  This library is free software; you can redistribute it and/or
>  *  modify it under the terms of the GNU Lesser General Public
>@@ -25,6 +25,7 @@
> #include "WebPageMessages.h"
> #include "WebPageProxy.h"
> #include "WebProcessProxy.h"
>+#include <WebCore/RealtimeMediaSourceCenter.h>
> #include <wtf/HashMap.h>
> #include <wtf/NeverDestroyed.h>
> 
>@@ -35,6 +36,8 @@ static const ASCIILiteral audioExtensionPath { "com.apple.webkit.microphone"_s }
> static const ASCIILiteral videoExtensionPath { "com.apple.webkit.camera"_s };
> #endif
> 
>+static const Seconds deviceChangeDebounceTimerInterval { 200_ms };
>+
> class ProcessState {
> public:
>     ProcessState() { }
>@@ -101,6 +104,11 @@ UserMediaProcessManager& UserMediaProcessManager::singleton()
>     return manager;
> }
> 
>+UserMediaProcessManager::UserMediaProcessManager()
>+    : m_debounceTimer(RunLoop::main(), this, &UserMediaProcessManager::captureDevicesChanged)
>+{
>+}
>+
> void UserMediaProcessManager::addUserMediaPermissionRequestManagerProxy(UserMediaPermissionRequestManagerProxy& proxy)
> {
>     processState(proxy.page().process()).addRequestManager(proxy);
>@@ -254,6 +262,58 @@ void UserMediaProcessManager::setCaptureEnabled(bool enabled)
>     }
> }
> 
>+void UserMediaProcessManager::captureDevicesChanged()
>+{
>+    auto& map = stateMap();
>+    for (auto& state : map) {
>+        auto* process = state.key;
>+        for (auto& manager : state.value->managers()) {
>+            if (map.find(process) == map.end())
>+                break;
>+            manager->captureDevicesChanged();
>+        }
>+    }
>+}
>+
>+void UserMediaProcessManager::beginMonitoringCaptureDevices()
>+{
>+    static std::once_flag onceFlag;
>+
>+    std::call_once(onceFlag, [this] {
>+        m_captureDevices = WebCore::RealtimeMediaSourceCenter::singleton().getMediaStreamDevices();
>+
>+        WebCore::RealtimeMediaSourceCenter::singleton().setDevicesChangedObserver([this]() {
>+            auto oldDevices = WTFMove(m_captureDevices);
>+            m_captureDevices = WebCore::RealtimeMediaSourceCenter::singleton().getMediaStreamDevices();
>+
>+            if (m_captureDevices.size() == oldDevices.size()) {
>+                bool haveChanges = false;
>+                for (auto &newDevice : m_captureDevices) {
>+                    if (newDevice.type() != WebCore::CaptureDevice::DeviceType::Camera && newDevice.type() != WebCore::CaptureDevice::DeviceType::Microphone)
>+                        continue;
>+
>+                    auto index = oldDevices.findMatching([&newDevice] (auto& oldDevice) {
>+                        return newDevice.persistentId() == oldDevice.persistentId() && newDevice.enabled() != oldDevice.enabled();
>+                    });
>+
>+                    if (index == notFound) {
>+                        haveChanges = true;
>+                        break;
>+                    }
>+                }
>+
>+                if (!haveChanges)
>+                    return;
>+            }
>+
>+            // When a device with camera and microphone is attached or detached, the CaptureDevice notification for
>+            // the different devices won't arrive at the same time so delay a bit so we can coalesce the callbacks.
>+            if (!m_debounceTimer.isActive())
>+                m_debounceTimer.startOneShot(deviceChangeDebounceTimerInterval);
>+        });
>+    });
>+}
>+
> } // namespace WebKit
> 
> #endif
>diff --git a/Source/WebKit/UIProcess/UserMediaProcessManager.h b/Source/WebKit/UIProcess/UserMediaProcessManager.h
>index 81998b4acb7ddf91d50a83c79d2e5cac3d187473..ae16ebed85d80bfdcac05ec6b80c7643b8ef528b 100644
>--- a/Source/WebKit/UIProcess/UserMediaProcessManager.h
>+++ b/Source/WebKit/UIProcess/UserMediaProcessManager.h
>@@ -1,5 +1,5 @@
> /*
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  *  This library is free software; you can redistribute it and/or
>  *  modify it under the terms of the GNU Lesser General Public
>@@ -21,6 +21,8 @@
> #if ENABLE(MEDIA_STREAM)
> 
> #include "UserMediaPermissionRequestManagerProxy.h"
>+#include <WebCore/CaptureDevice.h>
>+#include <wtf/RunLoop.h>
> 
> namespace WebKit {
> 
>@@ -31,6 +33,8 @@ public:
> 
>     static UserMediaProcessManager& singleton();
> 
>+    UserMediaProcessManager();
>+
>     void addUserMediaPermissionRequestManagerProxy(UserMediaPermissionRequestManagerProxy&);
>     void removeUserMediaPermissionRequestManagerProxy(UserMediaPermissionRequestManagerProxy&);
> 
>@@ -45,7 +49,13 @@ public:
> 
>     void denyNextUserMediaRequest() { m_denyNextRequest = true; }
> 
>+    void beginMonitoringCaptureDevices();
>+
> private:
>+    void captureDevicesChanged();
>+
>+    Vector<WebCore::CaptureDevice> m_captureDevices;
>+    RunLoop::Timer<UserMediaProcessManager> m_debounceTimer;
>     bool m_captureEnabled { true };
>     bool m_denyNextRequest { false };
> };
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.cpp b/Source/WebKit/UIProcess/WebPageProxy.cpp
>index 2dc0f33885b690584f47117e69deeef28c022a47..95fbc120dd80b41307ee7284db82d29c2c6a81fe 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.cpp
>+++ b/Source/WebKit/UIProcess/WebPageProxy.cpp
>@@ -3890,7 +3890,7 @@ void WebPageProxy::didChangeMainDocument(uint64_t frameID)
> void WebPageProxy::viewIsBecomingVisible()
> {
> #if ENABLE(MEDIA_STREAM)
>-    userMediaPermissionRequestManager().processPregrantedRequests();
>+    userMediaPermissionRequestManager().viewIsBecomingVisible();
> #endif
> }
> 
>@@ -6524,6 +6524,13 @@ void WebPageProxy::enumerateMediaDevicesForFrame(uint64_t userMediaID, uint64_t
> #endif
> }
> 
>+void WebPageProxy::beginMonitoringCaptureDevices()
>+{
>+#if ENABLE(MEDIA_STREAM)
>+    UserMediaProcessManager::singleton().beginMonitoringCaptureDevices();
>+#endif
>+}
>+
> void WebPageProxy::clearUserMediaState()
> {
> #if ENABLE(MEDIA_STREAM)
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.h b/Source/WebKit/UIProcess/WebPageProxy.h
>index 6a5b259fcaea6d8928f09889c798045eb10d8815..185ecf017938ca545b17b03bfca7b9db8faa0405 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.h
>+++ b/Source/WebKit/UIProcess/WebPageProxy.h
>@@ -1491,6 +1491,7 @@ private:
> #endif
>     void requestUserMediaPermissionForFrame(uint64_t userMediaID, uint64_t frameID, const WebCore::SecurityOriginData& userMediaDocumentOriginIdentifier, const WebCore::SecurityOriginData& topLevelDocumentOriginIdentifier, const WebCore::MediaStreamRequest&);
>     void enumerateMediaDevicesForFrame(uint64_t userMediaID, uint64_t frameID, const WebCore::SecurityOriginData& userMediaDocumentOriginData, const WebCore::SecurityOriginData& topLevelDocumentOriginData);
>+    void beginMonitoringCaptureDevices();
> 
>     void runModal();
>     void notifyScrollerThumbIsVisibleInRect(const WebCore::IntRect&);
>diff --git a/Source/WebKit/UIProcess/WebPageProxy.messages.in b/Source/WebKit/UIProcess/WebPageProxy.messages.in
>index b31f5f0be34cc948927a9b136d0cc32c51bc9c2a..6d29a9fd2e463df9a0f06e0347fac6451b5c0864 100644
>--- a/Source/WebKit/UIProcess/WebPageProxy.messages.in
>+++ b/Source/WebKit/UIProcess/WebPageProxy.messages.in
>@@ -287,6 +287,7 @@ messages -> WebPageProxy {
>     # MediaSteam messages
>     RequestUserMediaPermissionForFrame(uint64_t userMediaID, uint64_t frameID, struct WebCore::SecurityOriginData userMediaDocumentOriginIdentifier, struct WebCore::SecurityOriginData topLevelDocumentOriginIdentifier, struct WebCore::MediaStreamRequest request)
>     EnumerateMediaDevicesForFrame(uint64_t userMediaID, uint64_t frameID, struct WebCore::SecurityOriginData userMediaDocumentOriginIdentifier, struct WebCore::SecurityOriginData topLevelDocumentOriginIdentifier)
>+    BeginMonitoringCaptureDevices()
> #endif
> 
>     # Notification messages
>diff --git a/Source/WebKit/WebKit.xcodeproj/project.pbxproj b/Source/WebKit/WebKit.xcodeproj/project.pbxproj
>index c833c1fee5b333a6a57a1f213946975309605754..366219002b11e11b0de337ed8a85fe7ef890933f 100644
>--- a/Source/WebKit/WebKit.xcodeproj/project.pbxproj
>+++ b/Source/WebKit/WebKit.xcodeproj/project.pbxproj
>@@ -74,6 +74,7 @@
> 		074E75FE1DF2211900D318EC /* UserMediaProcessManager.h in Headers */ = {isa = PBXBuildFile; fileRef = 074E75FB1DF1FD1300D318EC /* UserMediaProcessManager.h */; };
> 		074E76021DF707BE00D318EC /* MediaDeviceSandboxExtensions.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 074E76001DF7075D00D318EC /* MediaDeviceSandboxExtensions.cpp */; };
> 		076E884E1A13CADF005E90FC /* APIContextMenuClient.h in Headers */ = {isa = PBXBuildFile; fileRef = 076E884D1A13CADF005E90FC /* APIContextMenuClient.h */; };
>+		0772811D21234FF600C8EF2E /* UserMediaPermissionRequestManager.h in Headers */ = {isa = PBXBuildFile; fileRef = 4A410F4319AF7B27002EBAB5 /* UserMediaPermissionRequestManager.h */; };
> 		07A5EBBB1C7BA43E00B9CA69 /* WKFrameHandleRef.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 07A5EBB91C7BA43E00B9CA69 /* WKFrameHandleRef.cpp */; };
> 		07A5EBBC1C7BA43E00B9CA69 /* WKFrameHandleRef.h in Headers */ = {isa = PBXBuildFile; fileRef = 07A5EBBA1C7BA43E00B9CA69 /* WKFrameHandleRef.h */; settings = {ATTRIBUTES = (Private, ); }; };
> 		0E97D74D200E900400BF6643 /* SafeBrowsingSPI.h in Headers */ = {isa = PBXBuildFile; fileRef = 0E97D74C200E8FF300BF6643 /* SafeBrowsingSPI.h */; };
>@@ -9420,6 +9421,7 @@
> 				CD491B131E73482100009066 /* UserMediaCaptureManagerProxy.h in Headers */,
> 				CD491B181E73525500009066 /* UserMediaCaptureManagerProxyMessages.h in Headers */,
> 				07297F9F1C17BBEA003F0735 /* UserMediaPermissionCheckProxy.h in Headers */,
>+				0772811D21234FF600C8EF2E /* UserMediaPermissionRequestManager.h in Headers */,
> 				4A3CC18B19B0640F00D14AEF /* UserMediaPermissionRequestManagerProxy.h in Headers */,
> 				4A3CC18D19B0641900D14AEF /* UserMediaPermissionRequestProxy.h in Headers */,
> 				074E75FE1DF2211900D318EC /* UserMediaProcessManager.h in Headers */,
>diff --git a/Source/WebKit/WebProcess/MediaStream/UserMediaPermissionRequestManager.cpp b/Source/WebKit/WebProcess/MediaStream/UserMediaPermissionRequestManager.cpp
>index 9ccace0577c7fbc8ff5706bdfad93e437cc6e1f3..5bb4e85bb600a84a5f98a69b200e777cdadbcc22 100644
>--- a/Source/WebKit/WebProcess/MediaStream/UserMediaPermissionRequestManager.cpp
>+++ b/Source/WebKit/WebProcess/MediaStream/UserMediaPermissionRequestManager.cpp
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2014 Igalia S.L.
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  *  This library is free software; you can redistribute it and/or
>  *  modify it under the terms of the GNU Lesser General Public
>@@ -40,6 +40,8 @@ namespace WebKit {
> 
> using namespace WebCore;
> 
>+static WebCore::ActivityState::Flags focusedActiveWindow = WebCore::ActivityState::IsFocused | WebCore::ActivityState::WindowIsActive;
>+
> static uint64_t generateRequestID()
> {
>     static uint64_t uniqueRequestID = 1;
>@@ -53,6 +55,8 @@ UserMediaPermissionRequestManager::UserMediaPermissionRequestManager(WebPage& pa
> 
> UserMediaPermissionRequestManager::~UserMediaPermissionRequestManager()
> {
>+    if (m_monitoringActivityStateChange)
>+        m_page.corePage()->removeActivityStateChangeObserver(*this);
>     for (auto& sandboxExtension : m_userMediaDeviceSandboxExtensions)
>         sandboxExtension.value->revoke();
> }
>@@ -222,6 +226,77 @@ void UserMediaPermissionRequestManager::revokeUserMediaDeviceSandboxExtensions(c
>     }
> }
> 
>+UserMediaClient::DeviceChangeObserverToken UserMediaPermissionRequestManager::addDeviceChangeObserver(WTF::Function<void()>&& observer)
>+{
>+    auto identifier = generateObjectIdentifier<WebCore::UserMediaClient::DeviceChangeObserverTokenType>();
>+    m_deviceChangeObserverMap.add(identifier, WTFMove(observer));
>+
>+    if (!m_monitoringDeviceChange) {
>+        m_monitoringDeviceChange = true;
>+        m_page.send(Messages::WebPageProxy::BeginMonitoringCaptureDevices());
>+    }
>+    return identifier;
>+}
>+
>+void UserMediaPermissionRequestManager::removeDeviceChangeObserver(UserMediaClient::DeviceChangeObserverToken token)
>+{
>+    bool wasRemoved = m_deviceChangeObserverMap.remove(token);
>+    ASSERT_UNUSED(wasRemoved, wasRemoved);
>+}
>+
>+void UserMediaPermissionRequestManager::captureDevicesChanged(DeviceAccessState accessState)
>+{
>+    // When new media input and/or output devices are made available, or any available input and/or
>+    // output device becomes unavailable, the User Agent MUST run the following steps in browsing
>+    // contexts where at least one of the following criteria are met, but in no other contexts:
>+
>+    // * The permission state of the "device-info" permission is "granted",
>+    // * any of the input devices are attached to an active MediaStream in the browsing context, or
>+    // * the active document is fully active and has focus.
>+
>+    bool isActive = (m_page.corePage()->activityState() & focusedActiveWindow) == focusedActiveWindow;
>+    if (!isActive && accessState == DeviceAccessState::NoAccess) {
>+        if (!isActive) {
>+            if (!m_monitoringActivityStateChange) {
>+                m_monitoringActivityStateChange = true;
>+                m_page.corePage()->addActivityStateChangeObserver(*this);
>+            }
>+            m_pendingDeviceChangeEvent = true;
>+            m_accessStateWhenDevicesChanged = accessState;
>+        }
>+        return;
>+    }
>+
>+    auto identifiers = m_deviceChangeObserverMap.keys();
>+    for (auto& identifier : identifiers) {
>+        auto iterator = m_deviceChangeObserverMap.find(identifier);
>+        if (iterator != m_deviceChangeObserverMap.end())
>+            (iterator->value)();
>+    }
>+}
>+
>+void UserMediaPermissionRequestManager::activityStateDidChange(WebCore::ActivityState::Flags oldActivityState, WebCore::ActivityState::Flags newActivityState)
>+{
>+    if ((newActivityState & focusedActiveWindow) != focusedActiveWindow)
>+        return;
>+
>+    RunLoop::main().dispatch([this, weakThis = makeWeakPtr(*this)]() mutable {
>+        if (!weakThis || !m_monitoringActivityStateChange)
>+            return;
>+
>+        m_monitoringActivityStateChange = false;
>+        m_page.corePage()->removeActivityStateChangeObserver(*this);
>+    });
>+
>+    if (!m_pendingDeviceChangeEvent)
>+        return;
>+
>+    m_pendingDeviceChangeEvent = false;
>+    auto accessState = m_accessStateWhenDevicesChanged;
>+    m_accessStateWhenDevicesChanged = DeviceAccessState::NoAccess;
>+    captureDevicesChanged(accessState);
>+}
>+
> } // namespace WebKit
> 
> #endif // ENABLE(MEDIA_STREAM)
>diff --git a/Source/WebKit/WebProcess/MediaStream/UserMediaPermissionRequestManager.h b/Source/WebKit/WebProcess/MediaStream/UserMediaPermissionRequestManager.h
>index a7efc8adeaaee50905ac40a785255e8f6f8b4140..824f7d3f9d87ce4dffc6e5bced2182fa0a6901e5 100644
>--- a/Source/WebKit/WebProcess/MediaStream/UserMediaPermissionRequestManager.h
>+++ b/Source/WebKit/WebProcess/MediaStream/UserMediaPermissionRequestManager.h
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2014 Igalia S.L.
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  *  This library is free software; you can redistribute it and/or
>  *  modify it under the terms of the GNU Lesser General Public
>@@ -24,6 +24,7 @@
> 
> #include "MediaDeviceSandboxExtensions.h"
> #include "SandboxExtension.h"
>+#include <WebCore/ActivityStateChangeObserver.h>
> #include <WebCore/MediaCanStartListener.h>
> #include <WebCore/MediaConstraints.h>
> #include <WebCore/MediaDevicesEnumerationRequest.h>
>@@ -37,8 +38,9 @@ namespace WebKit {
> 
> class WebPage;
> 
>-class UserMediaPermissionRequestManager
>-    : private WebCore::MediaCanStartListener {
>+enum class DeviceAccessState { NoAccess, SessionAccess, PersistentAccess };
>+
>+class UserMediaPermissionRequestManager : public CanMakeWeakPtr<UserMediaPermissionRequestManager>, private WebCore::MediaCanStartListener, private WebCore::ActivityStateChangeObserver {
> public:
>     explicit UserMediaPermissionRequestManager(WebPage&);
>     ~UserMediaPermissionRequestManager();
>@@ -55,11 +57,19 @@ public:
>     void grantUserMediaDeviceSandboxExtensions(MediaDeviceSandboxExtensions&&);
>     void revokeUserMediaDeviceSandboxExtensions(const Vector<String>&);
> 
>+    WebCore::UserMediaClient::DeviceChangeObserverToken addDeviceChangeObserver(WTF::Function<void()>&&);
>+    void removeDeviceChangeObserver(WebCore::UserMediaClient::DeviceChangeObserverToken);
>+
>+    void captureDevicesChanged(DeviceAccessState);
>+
> private:
>     void sendUserMediaRequest(WebCore::UserMediaRequest&);
> 
>     // WebCore::MediaCanStartListener
>-    void mediaCanStart(WebCore::Document&) override;
>+    void mediaCanStart(WebCore::Document&) final;
>+
>+    // WebCore::ActivityStateChangeObserver
>+    void activityStateDidChange(WebCore::ActivityState::Flags oldActivityState, WebCore::ActivityState::Flags newActivityState) final;
> 
>     void removeMediaRequestFromMaps(WebCore::UserMediaRequest&);
> 
>@@ -73,10 +83,29 @@ private:
>     HashMap<RefPtr<WebCore::MediaDevicesEnumerationRequest>, uint64_t> m_mediaDevicesEnumerationRequestToIDMap;
> 
>     HashMap<String, RefPtr<SandboxExtension>> m_userMediaDeviceSandboxExtensions;
>+
>+    HashMap<WebCore::UserMediaClient::DeviceChangeObserverToken, WTF::Function<void()>> m_deviceChangeObserverMap;
>+    DeviceAccessState m_accessStateWhenDevicesChanged { DeviceAccessState::NoAccess };
>+    bool m_monitoringDeviceChange { false };
>+    bool m_pendingDeviceChangeEvent { false };
>+    bool m_monitoringActivityStateChange { false };
> };
> 
> } // namespace WebKit
> 
>+namespace WTF {
>+
>+template<> struct EnumTraits<WebKit::DeviceAccessState> {
>+    using values = EnumValues<
>+        WebKit::DeviceAccessState,
>+        WebKit::DeviceAccessState::NoAccess,
>+        WebKit::DeviceAccessState::SessionAccess,
>+        WebKit::DeviceAccessState::PersistentAccess
>+    >;
>+};
>+
>+} // namespace WTF
>+
> #endif // ENABLE(MEDIA_STREAM)
> 
> #endif // UserMediaPermissionRequestManager_h
>diff --git a/Source/WebKit/WebProcess/WebCoreSupport/WebUserMediaClient.cpp b/Source/WebKit/WebProcess/WebCoreSupport/WebUserMediaClient.cpp
>index 6f605742eec304202a6404b535bca7c5559b4fd1..0b06d639299db54f74c8a026d023a069970d0ee3 100644
>--- a/Source/WebKit/WebProcess/WebCoreSupport/WebUserMediaClient.cpp
>+++ b/Source/WebKit/WebProcess/WebCoreSupport/WebUserMediaClient.cpp
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2014 Igalia S.L.
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  *  This library is free software; you can redistribute it and/or
>  *  modify it under the terms of the GNU Lesser General Public
>@@ -62,6 +62,16 @@ void WebUserMediaClient::cancelMediaDevicesEnumerationRequest(MediaDevicesEnumer
>     m_page.userMediaPermissionRequestManager().cancelMediaDevicesEnumeration(request);
> }
> 
>+WebUserMediaClient::DeviceChangeObserverToken WebUserMediaClient::addDeviceChangeObserver(WTF::Function<void()>&& observer)
>+{
>+    return m_page.userMediaPermissionRequestManager().addDeviceChangeObserver(WTFMove(observer));
>+}
>+
>+void WebUserMediaClient::removeDeviceChangeObserver(DeviceChangeObserverToken token)
>+{
>+    m_page.userMediaPermissionRequestManager().removeDeviceChangeObserver(token);
>+}
>+
> } // namespace WebKit;
> 
> #endif // MEDIA_STREAM
>diff --git a/Source/WebKit/WebProcess/WebCoreSupport/WebUserMediaClient.h b/Source/WebKit/WebProcess/WebCoreSupport/WebUserMediaClient.h
>index a6e313262d5ba7c4baf43bd304f3d8698094f36c..10930453ce797edd90de76f0354b9a1d406f2e6e 100644
>--- a/Source/WebKit/WebProcess/WebCoreSupport/WebUserMediaClient.h
>+++ b/Source/WebKit/WebProcess/WebCoreSupport/WebUserMediaClient.h
>@@ -1,6 +1,6 @@
> /*
>  * Copyright (C) 2014 Igalia S.L.
>- * Copyright (C) 2016 Apple Inc. All rights reserved.
>+ * Copyright (C) 2016-2018 Apple Inc. All rights reserved.
>  *
>  *  This library is free software; you can redistribute it and/or
>  *  modify it under the terms of the GNU Lesser General Public
>@@ -42,6 +42,9 @@ private:
>     void enumerateMediaDevices(WebCore::MediaDevicesEnumerationRequest&) final;
>     void cancelMediaDevicesEnumerationRequest(WebCore::MediaDevicesEnumerationRequest&) final;
> 
>+    DeviceChangeObserverToken addDeviceChangeObserver(WTF::Function<void()>&&) final;
>+    void removeDeviceChangeObserver(DeviceChangeObserverToken) final;
>+
>     void initializeFactories();
> 
>     WebPage& m_page;
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.cpp b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>index 51143a32db4099e6fff5a58c04b5a0f7784778e2..a41ed0e30a34b6adc14bd29ee8e5db2e3604b53e 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.cpp
>@@ -3757,6 +3757,12 @@ void WebPage::didCompleteMediaDeviceEnumeration(uint64_t userMediaID, const Vect
> {
>     m_userMediaPermissionRequestManager->didCompleteMediaDeviceEnumeration(userMediaID, devices, WTFMove(deviceIdentifierHashSalt), originHasPersistentAccess);
> }
>+
>+void WebPage::captureDevicesChanged(DeviceAccessState accessState)
>+{
>+    m_userMediaPermissionRequestManager->captureDevicesChanged(accessState);
>+}
>+
> #if ENABLE(SANDBOX_EXTENSIONS)
> void WebPage::grantUserMediaDeviceSandboxExtensions(MediaDeviceSandboxExtensions&& extensions)
> {
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.h b/Source/WebKit/WebProcess/WebPage/WebPage.h
>index 408addd08e3c29829625274789c9eb591171451e..7136c1168ce13e25ad365f037f46b8b70d3f3e5d 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.h
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.h
>@@ -228,6 +228,7 @@ class WebTouchEvent;
> class WebCredentialsMessenger;
> class RemoteLayerTreeTransaction;
> 
>+enum class DeviceAccessState;
> enum FindOptions : uint16_t;
> enum class DragControllerAction;
> 
>@@ -565,6 +566,7 @@ public:
> #if ENABLE(MEDIA_STREAM)
>     UserMediaPermissionRequestManager& userMediaPermissionRequestManager() { return *m_userMediaPermissionRequestManager; }
>     void prepareToSendUserMediaPermissionRequest();
>+    void captureDevicesChanged(DeviceAccessState);
> #endif
> 
>     void elementDidFocus(WebCore::Node*);
>diff --git a/Source/WebKit/WebProcess/WebPage/WebPage.messages.in b/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>index 1c44d77e6524d636623e4246f256a5716b1c0379..cd3a5f830fdd6efa550b692417d16e040783a6ad 100644
>--- a/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>+++ b/Source/WebKit/WebProcess/WebPage/WebPage.messages.in
>@@ -319,6 +319,7 @@ messages -> WebPage LegacyReceiver {
>     UserMediaAccessWasGranted(uint64_t userMediaID, WebCore::CaptureDevice audioDevice, WebCore::CaptureDevice videoDevice, String mediaDeviceIdentifierHashSalt)
>     UserMediaAccessWasDenied(uint64_t userMediaID, uint64_t reason, String invalidConstraint)
>     DidCompleteMediaDeviceEnumeration(uint64_t userMediaID, Vector<WebCore::CaptureDevice> devices, String mediaDeviceIdentifierHashSalt, bool hasPersistentAccess)
>+    CaptureDevicesChanged(enum WebKit::DeviceAccessState accessState)
> #if ENABLE(SANDBOX_EXTENSIONS)
>     GrantUserMediaDeviceSandboxExtensions(WebKit::MediaDeviceSandboxExtensions sandboxExtensions)
>     RevokeUserMediaDeviceSandboxExtensions(Vector<String> sandboxExtensionIDs)
>diff --git a/LayoutTests/ChangeLog b/LayoutTests/ChangeLog
>index bff88267835d9debaeb8c2fb1b30357da3079d75..be4a03368d16420dacec82824d3f456d2fe32ba7 100644
>--- a/LayoutTests/ChangeLog
>+++ b/LayoutTests/ChangeLog
>@@ -1,3 +1,14 @@
>+2018-08-15  Eric Carlson  <eric.carlson@apple.com>
>+
>+        [MediaStream] Move capture device monitoring to WebKit
>+        https://bugs.webkit.org/show_bug.cgi?id=188521
>+        <rdar://problem/43251787>
>+
>+        Reviewed by Youenn Fablet.
>+
>+        * fast/mediastream/device-change-event-2-expected.txt: Updated.
>+        * fast/mediastream/device-change-event-2.html: Updated.
>+
> 2018-08-15  Per Arne Vollan  <pvollan@apple.com>
> 
>         Layout Test editing/input/press-tab-during-ime-composition.html is failing
>diff --git a/LayoutTests/fast/mediastream/device-change-event-2-expected.txt b/LayoutTests/fast/mediastream/device-change-event-2-expected.txt
>index 64c6b61076faaa3de4f8168f7969cf10f607a69d..8dcf526fd60245546701b67a6fe9b2c90e8750be 100644
>--- a/LayoutTests/fast/mediastream/device-change-event-2-expected.txt
>+++ b/LayoutTests/fast/mediastream/device-change-event-2-expected.txt
>@@ -1,3 +1,6 @@
> 
> PASS 'devicechange' event fired when device list changes 
>+PASS 'devicechange' events fired quickly are coalesced 
>+PASS 'devicechange' event is not fired when the document doesn't has focus or permission to capture 
>+PASS 'devicechange' event is fired when the document doesn't has focus but has permission to capture 
> 
>diff --git a/LayoutTests/fast/mediastream/device-change-event-2.html b/LayoutTests/fast/mediastream/device-change-event-2.html
>index 43d5f2bdfedd91ecbd23fc71b83571e0707b255b..614b8d1109dc790299bdbb708becf6ab47939aa5 100644
>--- a/LayoutTests/fast/mediastream/device-change-event-2.html
>+++ b/LayoutTests/fast/mediastream/device-change-event-2.html
>@@ -6,16 +6,25 @@
>     <script src="../../resources/testharness.js"></script>
>     <script src="../../resources/testharnessreport.js"></script>
>     <script>
>-    let deviceIds = [];
>-    promise_test(async (test) => {
>+    let stream = null;
>+    
>+    let setup = async (test) => {
>         if (!window.testRunner)
>             return Promise.reject("test requires internal API");
> 
>         test.add_cleanup(() => { testRunner.resetMockMediaDevices(); });
> 
>         testRunner.setUserMediaPermission(true);
>+        
>+        stream = null;
>+    }
>+
>+    promise_test(async (test) => {
>+    
>+        await setup(test);
> 
>-        await navigator.mediaDevices.getUserMedia({ audio:true, video:true });
>+        await navigator.mediaDevices.getUserMedia({ audio:true, video:true })
>+            .then(s => stream = s)
> 
>         let devices = await navigator.mediaDevices.enumerateDevices();
> 
>@@ -29,7 +38,7 @@
>         await new Promise((resolve, reject) => {
>             navigator.mediaDevices.ondevicechange = resolve;
>             setTimeout(() => {
>-                console.log("event 1 taking a long time");
>+                console.log("event 1 took too long");
>                 resolve();
>             }, 5000);
>             testRunner.addMockCameraDevice("id1", "my camera");
>@@ -41,7 +50,7 @@
>         await new Promise((resolve, reject) => {
>             navigator.mediaDevices.ondevicechange = resolve;
>             setTimeout(() => {
>-                console.log("event 2 taking a long time");
>+                console.log("event 2 took too long");
>                 resolve();
>             }, 5000);
>             testRunner.addMockMicrophoneDevice("id2", "my mic");
>@@ -51,6 +60,102 @@
>         assert_equals(devices[0].label, "my mic");
> 
>     }, "'devicechange' event fired when device list changes");
>+
>+    promise_test(async (test) => {
>+
>+        await setup(test);
>+
>+        let eventCount = 0;
>+        await new Promise((resolve, reject) => {
>+            navigator.mediaDevices.ondevicechange = (evt) => {
>+                ++eventCount;
>+                setTimeout(() => {
>+                    resolve();
>+                }, 500);
>+            }
>+
>+            setTimeout(() => {
>+                console.log("navigator.mediaDevices.ondevicechange took too long");
>+                resolve();
>+            }, 4000);
>+
>+            testRunner.addMockMicrophoneDevice("id4", "microphone 3");
>+            testRunner.addMockMicrophoneDevice("id5", "microphone 4");
>+        });
>+        assert_equals(eventCount, 1, "one event fired");
>+
>+    }, "'devicechange' events fired quickly are coalesced");
>+
>+
>+    promise_test(async (test) => {
>+
>+        await setup(test);
>+
>+        await new Promise((resolve, reject) => {
>+            let timeout = setTimeout(() => {
>+                console.log("window.onblur took too long");
>+                resolve();
>+            }, 5000);
>+
>+            window.onblur = () => {
>+                clearTimeout(timeout);
>+                resolve();
>+            }
>+        
>+            internals.setPageIsFocusedAndActive(false);
>+        });
>+
>+        await new Promise((resolve, reject) => {
>+            assert_false(document.hasFocus(), "document.hasFocus()");
>+
>+            navigator.mediaDevices.ondevicechange = () => {
>+                assert_true(document.hasFocus(), "devicechange should only fire when the document is focused and active");
>+                resolve();
>+            };
>+
>+            setTimeout(() => {
>+                internals.setPageIsFocusedAndActive(true);
>+            }, 200);
>+
>+            testRunner.addMockMicrophoneDevice("id3", "microphone 2");
>+        });
>+
>+    }, "'devicechange' event is not fired when the document doesn't has focus or permission to capture");
>+
>+    promise_test(async (test) => {
>+
>+        await setup(test);
>+
>+        await navigator.mediaDevices.getUserMedia({ audio:true, video:true })
>+            .then(s => stream = s);
>+
>+        await new Promise((resolve, reject) => {
>+            let timeout = setTimeout(() => {
>+                console.log("window.onblur took too long");
>+                resolve();
>+            }, 5000);
>+
>+            window.onblur = () => {
>+                clearTimeout(timeout);
>+                resolve();
>+            }
>+        
>+            internals.setPageIsFocusedAndActive(false);
>+        });
>+
>+        await new Promise((resolve, reject) => {
>+            assert_false(document.hasFocus(), "document.hasFocus()");
>+
>+            navigator.mediaDevices.ondevicechange = () => {
>+                assert_false(document.hasFocus(), "devicechange should fire when the document is not focused but can capture");
>+                resolve();
>+            };
>+
>+            testRunner.addMockMicrophoneDevice("id3", "microphone 2");
>+        });
>+
>+    }, "'devicechange' event is fired when the document doesn't has focus but has permission to capture");
>+
>     </script>
> </head>
> <body>

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Attachments on bug 188521: 347035 | 347229 | 347366 | 347382 | 347496 | 347501