Add MediaSession APIs to sl4a to support PTS automation.

Add APIs to MediaSessionFacade. Split callback into its own class.
Update deprecated APIs in ContactsFacade.
Fix build breakage in AndroidFacade.
Move media related facades into their own package.
Update build file to accommodate new output directory for sl4a.

Change-Id: I3dea464bfdf4349a4ec9571c00faf25f4b0fe831
11 files changed