The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9470c458579dffdc25b05ed186000706ce70e7ed

commit 9470c458579dffdc25b05ed186000706ce70e7ed
Author: Becca Hughes <beccahughes@chromium.org>
Date: Thu Jul 27 22:51:05 2017

Media Engagement: Allow high MEI sites to bypass autoplay policies.

Sites with a high MEI score should bypass autoplay policies. This
is behind a feature flag that is separate from collecting the data.

BUG= 738454 

Change-Id: I6eb64a0ce0b196332d380337f5ed333f903f9784
Reviewed-on: https://chromium-review.googlesource.com/558348
Commit-Queue: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490038}
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/chrome/browser/DEPS
[add] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/chrome/browser/media/media_engagement_autoplay_browsertest.cc
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/chrome/browser/media/media_engagement_browsertest.cc
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/chrome/browser/media/media_engagement_contents_observer.cc
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/chrome/browser/media/media_engagement_contents_observer.h
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/chrome/test/BUILD.gn
[add] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/chrome/test/data/media/engagement/engagement_autoplay_iframe_test.html
[add] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/chrome/test/data/media/engagement/engagement_autoplay_iframe_test_frame.html
[add] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/chrome/test/data/media/engagement/engagement_autoplay_test.html
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/content/child/runtime_features.cc
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/content/renderer/render_frame_impl.cc
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/content/renderer/render_frame_impl.h
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/media/base/media_switches.cc
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/media/base/media_switches.h
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/third_party/WebKit/Source/core/dom/Document.h
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/third_party/WebKit/Source/core/frame/WebLocalFrameImpl.cpp
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/third_party/WebKit/Source/core/frame/WebLocalFrameImpl.h
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/third_party/WebKit/Source/core/html/media/AutoplayPolicy.cpp
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/third_party/WebKit/Source/platform/RuntimeEnabledFeatures.json5
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/third_party/WebKit/Source/platform/exported/WebRuntimeFeatures.cpp
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/third_party/WebKit/public/BUILD.gn
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/third_party/WebKit/public/platform/WebRuntimeFeatures.h
[add] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/third_party/WebKit/public/platform/media_engagement.mojom
[modify] https://crrev.com/9470c458579dffdc25b05ed186000706ce70e7ed/third_party/WebKit/public/web/WebLocalFrame.h