am 040301ca: Start sending out buffering updates earlier (after preparation has completed) instead of only after playback has started.

Merge commit '040301cad17e447d760e7b7e54b79c8c294415ea' into froyo-plus-aosp

* commit '040301cad17e447d760e7b7e54b79c8c294415ea':
  Start sending out buffering updates earlier (after preparation has completed) instead of only after playback has started.