bug:5710646
First, if we exit the full screen mode while playing, we can continue to play
in inline mode.
If it is paused, then we can avoid a reload if user try to play the same video
again after the full screen mode.
webkit change:
https://android-git.corp.google.com/g/#/c/202138/
Change-Id: Ia69fa22a50d916cd8dd2b995cf3531fe9b637531