Extract the action bar interface.

So that we can use different implementation for different API levels.

**NOTE**
This change is going to be replaced by the ActionBar compat library
when it gets ready. The purpose of this change is making Gallery/Camera
run on GB.

bug: 6927267

Change-Id: Ic8bb2518918168ea889db6452d6760de390d96b2
15 files changed
tree: fec327ba0551f3dcc5dac643309ac8dde4df0ef7
  1. gallerycommon/
  2. src/
  3. src_pd/
  4. tests/