The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1b8485c6d66e754d5fd729d636e5d1c50a261e21

commit 1b8485c6d66e754d5fd729d636e5d1c50a261e21
Author: Hajime Hoshi <hajimehoshi@chromium.org>
Date: Tue Oct 17 09:52:33 2017

Revert "Revert "Add RendererSchedulerImpl::V8TaskQueue()""

This reverts commit da95168e109c81c024d6edb25062af0a6fe2e7cd.

Reason for revert: The test failure was already fixed at  crbug.com/771729 

Bug:  773970 

Original change's description:
> Revert "Add RendererSchedulerImpl::V8TaskQueue()"
> 
> This reverts commit f6af34a1a523e06a8ef371f21469050795924eb5.
> 
> Reason for revert: Speculative revert for layout test flake starting at https://uberchromegw.corp.google.com/i/chromium.webkit/builders/WebKit%20Win7%20%28dbg%29/builds/11385   - will reland if the flake does not disappear
> 
> Original change's description:
> > Add RendererSchedulerImpl::V8TaskQueue()
> > 
> > V8 tasks like GC are now posted to a loading task queue. This CL introduces
> > V8 task queue at RendererSchedulerImpl and uses it for V8 tasks for better
> > scheduling.
> > 
> > Bug: n/a
> > Change-Id: If65ad1b12e59de36a448dddc0da0777d2338b58a
> > Reviewed-on: https://chromium-review.googlesource.com/697485
> > Reviewed-by: Alexander Timin <altimin@chromium.org>
> > Reviewed-by: Kentaro Hara <haraken@chromium.org>
> > Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#506364}
> 
> TBR=isherman@chromium.org,hajimehoshi@chromium.org,haraken@chromium.org,skyostil@chromium.org,altimin@chromium.org
> 
> # Not skipping CQ checks because original CL landed > 1 day ago.
> 
> Bug: n/a
> Change-Id: I353c558a1a637fcf70da20e537be4e218a993af9
> Reviewed-on: https://chromium-review.googlesource.com/705135
> Reviewed-by: Ken Rockot <rockot@chromium.org>
> Commit-Queue: Ken Rockot <rockot@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#507199}

TBR=isherman@chromium.org,rockot@chromium.org,hajimehoshi@chromium.org,haraken@chromium.org,skyostil@chromium.org,altimin@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: n/a
Change-Id: I2555e1297d430de4f193a5d478a515a74078cc84
Reviewed-on: https://chromium-review.googlesource.com/722401
Reviewed-by: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509339}
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/bindings/core/v8/V8Initializer.cpp
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/core/dom/IdleDeadlineTest.cpp
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/core/dom/ScriptedIdleTaskControllerTest.cpp
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/platform/scheduler/child/web_scheduler.h
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/platform/scheduler/child/web_scheduler_impl.cc
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/platform/scheduler/child/web_scheduler_impl.h
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/platform/scheduler/child/webthread_impl_for_worker_scheduler.cc
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_task_queue.cc
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_task_queue.h
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/third_party/WebKit/Source/platform/scheduler/renderer/renderer_web_scheduler_impl.cc
[modify] https://crrev.com/1b8485c6d66e754d5fd729d636e5d1c50a261e21/tools/metrics/histograms/enums.xml