Gallery2: fix can not add gallery widget to home screen

When selected to add a cropped picture to home screen,
the binder transaction failed because it was too large,
add widget failed.

We reduce the allowed maximum bitmap size in intent,
to make sure that binder size will not greater than 1M.

CRs-Fixed: 528927

Change-Id: Id63c8503dead66ab18531a78b0b4206d1fd30d07
Gallery2: fix time text display issue

In TrimTimeBar, mTimeBounds may never get updated, which causes time
text to be out of screen. Give mTimeBounds a reasonable intial value to
prevent this.

Change-Id: Ie0378acde5b856340ac0dccdc0a688438b7827e0
CRs-Fixed: 627787