Gallery2: modify some UI interface according to UI document.

1. Modify layout of actionbar when selected photo;
2. Modify menu string in Video Page;
3. Modify compare button's position in photo editor;
4. Modify bottom panel's height in photo editor;
5. Set video play icon to 48dp in PhotoView;

Change-Id: Ic660d5dde87998e87eb02482ac7ba7e2ba2f0bb1
CRs-Fixed: 1010984
15 files changed