AI 146646: am: CL 146645 am: CL 146643 Clean up and commenting of the JetBoy JET...

  Fixed JetPlayer initialization code and pause when the app loses focus.
  Removed mute mask hack.
  Cleaned up event ID declaration and check (event value is a byte, not a String).
  Add extensive comments for the JetPlayer code.
  Original author: jmtrivi
  Merged from: //branches/cupcake/...
  Original author: android-build

Automated import of CL 146646