Gallery2: set the progress bar when we pause the video

The progress bar isn't set when we pause the video.

Set the progress bar when we pause the video

CRs-Fixed: BZ1623

Change-Id: I3d450df6fdf8195983692ed8a71ab42717e9c36c
Gallery2: invalidate album view even only size changed

After deleting the pictures, it didn't request to
update the view. so the left pictures can not be
updated and displayed instantly.

Invalidate album view even only size changed to
make it shown correctly.

CRs-Fixed: 393995

Change-Id: I9924edf3a1d0e46d045425b9d078758e8cb50685