The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b8e2b30a8594f8b98fc2903067fff235e32cece7

commit b8e2b30a8594f8b98fc2903067fff235e32cece7
Author: Hiroki Nakagawa <nhiroki@chromium.org>
Date: Fri Jul 14 11:55:27 2017

Worker: Clarify thread affinity for improving code maintainability

To improve code maintainability, this CL clarifies thread affinity of
initialization and shutdown functions in worker classes. This does not change
any existing behavior.

Bug:  741227 
Change-Id: I25fe7278130c90292b79cdd5607f10a0ef92f198
Reviewed-on: https://chromium-review.googlesource.com/567609
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486740}
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorldTest.cpp
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/core/css/threaded/MultiThreadedTestUtil.h
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/core/workers/WorkerBackingThread.h
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/core/workers/WorkerThread.cpp
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/core/workers/WorkerThread.h
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/core/workers/WorkletThreadHolder.h
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/modules/fetch/DataConsumerHandleTestUtil.cpp
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/modules/webdatabase/DatabaseThread.cpp
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/platform/WebThreadSupportingGC.cpp
[modify] https://crrev.com/b8e2b30a8594f8b98fc2903067fff235e32cece7/third_party/WebKit/Source/platform/WebThreadSupportingGC.h