AI 146643: Clean up and commenting of the JetBoy JET demo code:
  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.
  BUG=1596727

Automated import of CL 146643
2 files changed