Avoid redundant reload in inline mode after exit from full screen.

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