Hide action bar after a timeout

Also make sure:
1) Action bar does not go away when the menu is showing
2) Extend the timeout if user swipe to a new image when action bar is visible
3) Hide action bar immediately when double-tap-to-zoom starts
4) Action bar persists in filmstrip mode (i.e. non-fullscreen mode)

Bug: 10750342
Change-Id: I820dc2b57ced61f91246fffe3fecc4e60ea187ca
3 files changed