Put latest MediaControlView2/VideoView2 code

This CL brings latest MediaControlView2/VideoView2 code from
experimental, and it does the following:
 - Fullscreen button support (ag/3490251)
 - Set prev/next listener and controlling button visibility (ag/3498244)

Test: Ran VideoViewTest app
Change-Id: I1a64a9c98dcc625b504785728673edbee7b6935d
4 files changed