am e192c727: am 87a4cb67: Explicitly mark activities as exported true/false, since the CDD says that everything that isn\'t marked is public by default, and should be implemented by any replacement music app. This changes marks the various playback activities and the 

Merge commit 'e192c7277cf0d5d3b2bb0a280eef9ead5adff2fd'

* commit 'e192c7277cf0d5d3b2bb0a280eef9ead5adff2fd':
  Explicitly mark activities as exported true/false, since the CDD says