Fix camera bugs found overnight.

 - Fix crash in CameraWidgetFrame after rotating to landscape
 - Fix pages drift to the left bug
 - Address Jim's comments on c/245706
 - Disable camera widget if landscape

Bug: 7419070
Bug: 7417798
Bug: 7418781
Change-Id: I5c730c7c1baf3c1872367b6392e6786578765298