Issue 692098  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12

commit abc082487c58110e72e8d8e9ff6fa0b7abc9dd12
Author: zqzhang <zqzhang@chromium.org>
Date: Thu Mar 02 16:07:14 2017

[Blink>Media] Add heuristic for dominant video detection for Android

This CL adds the heuristic for dominant video detection for
Android, in which we use the fullscreen state of the document and
the viewport intersection to determine if a video is the dominant
content in fullscreen mode (as the page may fullscreen the
embedding div instead of the video element).

BUG= 695462 

Review-Url: https://codereview.chromium.org/2696893002
Cr-Commit-Position: refs/heads/master@{#454272}

[modify] https://crrev.com/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12/media/blink/webmediaplayer_impl.cc
[modify] https://crrev.com/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12/media/blink/webmediaplayer_impl.h
[modify] https://crrev.com/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12/third_party/WebKit/Source/core/BUILD.gn
[modify] https://crrev.com/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12/third_party/WebKit/Source/core/html/BUILD.gn
[modify] https://crrev.com/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12/third_party/WebKit/Source/core/html/HTMLVideoElement.cpp
[modify] https://crrev.com/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12/third_party/WebKit/Source/core/html/HTMLVideoElement.h
[add] https://crrev.com/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12/third_party/WebKit/Source/core/html/MediaCustomControlsFullscreenDetector.cpp
[add] https://crrev.com/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12/third_party/WebKit/Source/core/html/MediaCustomControlsFullscreenDetector.h
[add] https://crrev.com/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12/third_party/WebKit/Source/core/html/MediaCustomControlsFullscreenDetectorTest.cpp
[modify] https://crrev.com/abc082487c58110e72e8d8e9ff6fa0b7abc9dd12/third_party/WebKit/public/platform/WebMediaPlayer.h