Gallery2: fix cropview shows abnormal if lock and rotate screen

The canvas value will effect the screenbounds value.
When screen is locked, the screen orientation will be force
changed to portrait but the screenbounds will still use
landscape value.

To fix this issue, if found screenbounds changed, we will make
dirty true to update the view.

CRs-Fixed: 557210

Change-Id: Ia84581d122da76f084117dfd0a195ce2784e18c9
Merge "Gallery2: fix cropview shows abnormal if lock and rotate screen" into du44