Recalculate layer transparent regions when TitleBar is hidden/shown

Recalculating the transparent region when the
TitleBar is hidden removes the Browser UI layer from
SurfaceFlinger.

Also fixes the blank title bar issue in scrolling and
full screen video playback cases.

Change-Id: I5e9335c2f84891da8558d1943e80c0312952abd0
1 file changed