Build is broken:
webkit_tests virtual/display_list_2d_canvas/fast/canvas/canvas-createImageBitmap-invalid-blob-in-workers.html
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=virtual%2Fdisplay_list_2d_canvas%2Ffast%2Fcanvas%2Fcanvas-createImageBitmap-invalid-blob-in-workers.html&testType=webkit_tests
webkit_tests virtual/gpu/fast/canvas/canvas-createImageBitmap-invalid-blob-in-workers.html
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=virtual%2Fgpu%2Ffast%2Fcanvas%2Fcanvas-createImageBitmap-invalid-blob-in-workers.html&testType=webkit_tests

Revision range:
chromium 416918 : 416929

Failing builders:
WebKit Linux MSAN: https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN

STDOUT: [Worker] Test createImageBitmap with invalid blobs in workers.
STDOUT: 
STDOUT: On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
STDOUT: 
STDOUT: 
STDOUT: Starting worker: ./resources/canvas-createImageBitmap-invalid-blob-in-workers.js
STDOUT: PASS [Worker] Promise rejected: InvalidStateError: The source image cannot be decoded.
STDOUT: PASS successfullyParsed is true
STDOUT: 
STDOUT: TEST COMPLETE
STDOUT: 
STDERR: ==4==WARNING: MemorySanitizer: use-of-uninitialized-value
STDERR:     #0 0xbf8ec5e in mark<blink::Visitor *> third_party/WebKit/Source/platform/heap/TraceTraits.h:74:17
STDERR:     #1 0xbf8ec5e in mark<blink::Visitor *> third_party/WebKit/Source/platform/heap/TraceTraits.h:194:0
STDERR:     #2 0xbf8ec5e in mark<blink::DOMArrayBuffer> third_party/WebKit/Source/platform/heap/Visitor.h:135:0
STDERR:     #3 0xbf8ec5e in tracePersistent<blink::Visitor *> third_party/WebKit/Source/platform/heap/Persistent.h:201:0
STDERR:     #4 0xbf8ec5e in trampoline third_party/WebKit/Source/platform/heap/Visitor.h:63:0
STDERR:     #5 0x3fdcfd6 in tracePersistentNode third_party/WebKit/Source/platform/heap/PersistentNode.h:56:9
STDERR:     #6 0x3fdcfd6 in tracePersistentNodes third_party/WebKit/Source/platform/heap/PersistentNode.cpp:101:0
STDERR:     #7 0x3fe477e in visitPersistents third_party/WebKit/Source/platform/heap/ThreadState.cpp:460:25
STDERR:     #8 0x3fe3afd in collectGarbageForTerminatingThread third_party/WebKit/Source/platform/heap/ThreadState.cpp:1728:9
STDERR:     #9 0x3fe2639 in runTerminationGC third_party/WebKit/Source/platform/heap/ThreadState.cpp:308:9
STDERR:     #10 0x3fbbb2e in detach third_party/WebKit/Source/platform/heap/Heap.cpp:278:17
STDERR:     #11 0x3fe40e6 in detachCurrentThread third_party/WebKit/Source/platform/heap/ThreadState.cpp:378:19
STDERR:     #12 0xfc6169e in shutdown third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp:99:22
STDERR:     #13 0xfc9ad79 in performShutdownOnWorkerThread third_party/WebKit/Source/core/workers/WorkerThread.cpp:606:31
STDERR:     #14 0x6bb591d in Run base/callback.h:56:12
STDERR:     #15 0x6bb591d in RunTask base/debug/task_annotator.cc:54:0
STDERR:     #16 0xbcfb96f in ProcessTaskFromWorkQueue third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc:311:19
STDERR:     #17 0xbcf4864 in DoWork third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc:215:13
STDERR:     #18 0x6bb591d in Run base/callback.h:56:12
STDERR:     #19 0x6bb591d in RunTask base/debug/task_annotator.cc:54:0
STDERR:     #20 0x69c3c8b in RunTask base/message_loop/message_loop.cc:488:19
STDERR:     #21 0x69c57ca in DeferOrRunPendingTask base/message_loop/message_loop.cc:497:5
STDERR:     #22 0x69c734b in DoWork base/message_loop/message_loop.cc:621:13
STDERR:     #23 0x69d328a in Run base/message_loop/message_pump_default.cc:35:31
STDERR:     #24 0x6a4a04c in Run base/run_loop.cc:35:10
STDERR:     #25 0x6ae104c in ThreadMain base/threading/thread.cc:307:3
STDERR:     #26 0x6acf5e5 in ThreadFunc base/threading/platform_thread_posix.cc:71:13
STDERR:     #27 0x7fed2a7bee99 in start_thread /build/eglibc-rrybNj/eglibc-2.15/nptl/pthread_create.c:308:0
STDERR:     #28 0x7fed2a09d38c in ?? /build/eglibc-rrybNj/eglibc-2.15/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:112:0
STDERR: 
STDERR:   Uninitialized value was created by a heap allocation
STDERR:     #0 0x4acf72 in operator new(unsigned long) ??:0
STDERR:     #1 0x3fe0953 in ThreadState third_party/WebKit/Source/platform/heap/ThreadState.cpp:195:18
STDERR:     #2 0xb7a2eda in initialize third_party/WebKit/Source/platform/exported/Platform.cpp:86:5
STDERR:     #3 0xc0205f1 in initialize third_party/WebKit/Source/web/WebKit.cpp:84:5
STDERR:     #4 0xaf64c79 in InitializeWebKit content/renderer/render_thread_impl.cc:1175:3
STDERR:     #5 0xaf5e89a in Init content/renderer/render_thread_impl.cc:638:3
STDERR:     #6 0xaf5d6cc in RenderThreadImpl content/renderer/render_thread_impl.cc:609:3
STDERR:     #7 0xaf5cd75 in Create content/renderer/render_thread_impl.cc:572:14
STDERR:     #8 0xb05c64e in RendererMain content/renderer/renderer_main.cc:186:5
STDERR:     #9 0x4ee2112 in RunZygote content/app/content_main_runner.cc:343:14
STDERR:     #10 0x4ee516c in RunNamedProcessTypeMain content/app/content_main_runner.cc:426:12
STDERR:     #11 0x4ee8681 in Run content/app/content_main_runner.cc:786:12
STDERR:     #12 0x4ec6b10 in ContentMain content/app/content_main.cc:20:28
STDERR:     #13 0x4ad5a0 in main content/shell/app/shell_main.cc:48:10
STDERR:     #14 0x7fed29fcb76c in __libc_start_main /build/eglibc-rrybNj/eglibc-2.15/csu/libc-start.c:226:0
STDERR: 
STDERR: SUMMARY: MemorySanitizer: use-of-uninitialized-value (/b/c/b/linux_layout/src/out/Release/content_shell+0xbf8ec5e)
STDERR: Exiting

Suspected change:
https://codereview.chromium.org/2303753003