The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/4d6bb36e3fcfb9742b6428e43a8e5df12681d0d0

commit 4d6bb36e3fcfb9742b6428e43a8e5df12681d0d0
Author: sunxd <sunxd@chromium.org>
Date: Thu Jun 08 18:17:06 2017

Add CompositorTouchAction to RuntimeEnabledFeatures.

We are now working on handling touch actions in cc, adding the
runtime enabled features would make it possible for the two
logics (main thread only and both main thread and cc) to co-exist.

The flag will also be useful when we lauch the feature in the
future.

BUG= 727839 

Review-Url: https://codereview.chromium.org/2930493002
Cr-Commit-Position: refs/heads/master@{#478026}

[modify] https://crrev.com/4d6bb36e3fcfb9742b6428e43a8e5df12681d0d0/content/child/runtime_features.cc
[modify] https://crrev.com/4d6bb36e3fcfb9742b6428e43a8e5df12681d0d0/content/public/common/content_features.cc
[modify] https://crrev.com/4d6bb36e3fcfb9742b6428e43a8e5df12681d0d0/content/public/common/content_features.h
[modify] https://crrev.com/4d6bb36e3fcfb9742b6428e43a8e5df12681d0d0/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
[modify] https://crrev.com/4d6bb36e3fcfb9742b6428e43a8e5df12681d0d0/third_party/WebKit/Source/platform/exported/WebRuntimeFeatures.cpp
[modify] https://crrev.com/4d6bb36e3fcfb9742b6428e43a8e5df12681d0d0/third_party/WebKit/public/platform/WebRuntimeFeatures.h

Awesome.