Gallery2: Displayed titles in ActionBar during video playback

There is no displayed titles in ActionBar during video playback

Add the ActionBar Flag to displayed titles in ActionBar during video playback

CRs-Fixed: 758779

Change-Id: I24da392c0dd64b8f1c520bfe75c90f38088c612a
Gallery2: fix app crash when there is no map app

ActivityNotFoundException happened after click showOnMap menu when
there is no map app.

Catch the Exception to avoid app crash.

CRs-Fixed: 753928

Change-Id: I7d811e4a636bed22935fcc050d97559ace44eb31
Gallery2: Fix undo button enable condition

When jump into interface of Image edit, the undo button is enable
at first, for the judgement of canUndo is set true, but actually
there is nothing to undo.

Change canUndo's judging condition.

CRs-Fixed: 759431

Change-Id: Idae9feaca62b5cdc67610cf332c2b65f1692dbb4