Promoting MediaViewer to stable

Also redoing the formatting of the overlay per design.

Also making sure we don't run the image event binding
when images are disabled.

Dependency: I6ab91b930c6c38370e8875bd38dcf97b95250a08
Change-Id: I4b10a438405f8734c1b5d4bb0955d07c489ccb9b
Merge "Promoting MediaViewer to stable"