am 006346e8: Change the bitmap callback signature to have a void return value.

Merge commit '006346e8f138b4e4b16c7a94b049c1646b009b52' into dalvik-dev

* commit '006346e8f138b4e4b16c7a94b049c1646b009b52':
  Change the bitmap callback signature to have a void return value.