[Android WebView] Support for fullscreen video with html controls.
Note: this patch only adds the implementation behind a flag,
and it does not enable this feature yet.
In fullscreen mode we render the AwContents (ie. the html controls) in a
FullscreenView instead of the WebView. We place this FullscreenView above
the ContentVideoView.
This is a follow-up cl to:
https://codereview.chromium.org/
315973004/
We currently don't support scrolling in fullscreen mode as it is not needed
for video.
BUG=385121
Review URL: https://codereview.chromium.org/
320273002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@280593 0039d316-1c4b-4281-b951-d872f2087c98