The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/028d7f3596fc288af858b934be6fc24cf1152a86

commit 028d7f3596fc288af858b934be6fc24cf1152a86
Author: Xida Chen <xidachen@chromium.org>
Date: Thu Mar 08 18:31:23 2018

Add a runtime enabled feature flag for raster-inducing scroll

In order to make sure that nothing breaks during our implementation of
raster-inducing scroll, we should just hide this new feature behind a
flag.

Bug:  820048 
Change-Id: I38b446cff82aa5f4c9e23b5fdb04f5895d218e2a
Reviewed-on: https://chromium-review.googlesource.com/955666
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541842}
[modify] https://crrev.com/028d7f3596fc288af858b934be6fc24cf1152a86/content/child/runtime_features.cc
[modify] https://crrev.com/028d7f3596fc288af858b934be6fc24cf1152a86/content/public/common/content_features.cc
[modify] https://crrev.com/028d7f3596fc288af858b934be6fc24cf1152a86/content/public/common/content_features.h
[modify] https://crrev.com/028d7f3596fc288af858b934be6fc24cf1152a86/third_party/WebKit/Source/platform/exported/WebRuntimeFeatures.cpp
[modify] https://crrev.com/028d7f3596fc288af858b934be6fc24cf1152a86/third_party/WebKit/Source/platform/runtime_enabled_features.json5
[modify] https://crrev.com/028d7f3596fc288af858b934be6fc24cf1152a86/third_party/WebKit/public/platform/WebRuntimeFeatures.h