Bug 188019

The following layout test is flaky on [insert platform]

imported/w3c/web-platform-tests/2dcontext/imagebitmap/createImageBitmap-drawImage.html

Probable cause:

Unknown, test has been flaky on both Release and Debug since around 7/1/2018 but since 7/24 the failure rate has accelerated in Debug

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fw3c%2Fweb-platform-tests%2F2dcontext%2Fimagebitmap%2FcreateImageBitmap-drawImage.html
--- /Volumes/Data/slave/ios-simulator-11-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/2dcontext/imagebitmap/createImageBitmap-drawImage-expected.txt
+++ /Volumes/Data/slave/ios-simulator-11-release-tests-wk2/build/layout-test-results/imported/w3c/web-platform-tests/2dcontext/imagebitmap/createImageBitmap-drawImage-actual.txt
@@ -1,3 +1,6 @@
+CONSOLE MESSAGE: Unhandled Promise Rejection: [object Event]
+
+Harness Error (FAIL), message = undefined
 
 PASS createImageBitmap from an HTMLCanvasElement, and drawImage on the created ImageBitmap 
 PASS createImageBitmap from an HTMLCanvasElement scaled down, and drawImage on the created ImageBitmap 
@@ -9,11 +12,11 @@
 PASS createImageBitmap from an HTMLVideoElement scaled up, and drawImage on the created ImageBitmap 
 PASS createImageBitmap from an HTMLVideoElement resized, and drawImage on the created ImageBitmap 
 PASS createImageBitmap from an HTMLVideoElement with negative sw/sh, and drawImage on the created ImageBitmap 
-PASS createImageBitmap from an HTMLVideoElement from a data URL, and drawImage on the created ImageBitmap 
-PASS createImageBitmap from an HTMLVideoElement from a data URL scaled down, and drawImage on the created ImageBitmap 
-PASS createImageBitmap from an HTMLVideoElement from a data URL scaled up, and drawImage on the created ImageBitmap 
-PASS createImageBitmap from an HTMLVideoElement from a data URL resized, and drawImage on the created ImageBitmap 
-PASS createImageBitmap from an HTMLVideoElement from a data URL with negative sw/sh, and drawImage on the created ImageBitmap 
+FAIL createImageBitmap from an HTMLVideoElement from a data URL, and drawImage on the created ImageBitmap promise_test: Unhandled rejection with value: object "[object Event]"
+FAIL createImageBitmap from an HTMLVideoElement from a data URL scaled down, and drawImage on the created ImageBitmap promise_test: Unhandled rejection with value: object "[object Event]"
+FAIL createImageBitmap from an HTMLVideoElement from a data URL scaled up, and drawImage on the created ImageBitmap promise_test: Unhandled rejection with value: object "[object Event]"
+FAIL createImageBitmap from an HTMLVideoElement from a data URL resized, and drawImage on the created ImageBitmap promise_test: Unhandled rejection with value: object "[object Event]"
+FAIL createImageBitmap from an HTMLVideoElement from a data URL with negative sw/sh, and drawImage on the created ImageBitmap promise_test: Unhandled rejection with value: object "[object Event]"
 PASS createImageBitmap from a bitmap HTMLImageElement, and drawImage on the created ImageBitmap 
 PASS createImageBitmap from a bitmap HTMLImageElement scaled down, and drawImage on the created ImageBitmap 
 PASS createImageBitmap from a bitmap HTMLImageElement scaled up, and drawImage on the created ImageBitmap