CameraTile: Launch default gallery app when long pressing active camera tile

Currently long pressing this does nothing. It makes sense to launch the default
gallery app from here if a user long presses in order to see pictures that
they've taken from the smaller camera preview.

Change-Id: Iad73a291443eb2a12e1399f24eeeec61ec945bf5
Merge remote branch 'cm/cm-11.0' into cm-11.0