am 7ed7668b: Merge "Calculate audio media drift time from AudioSource" into gingerbread

Merge commit '7ed7668b30e70ca8e3f0f183364433326ed29f39' into gingerbread-plus-aosp

* commit '7ed7668b30e70ca8e3f0f183364433326ed29f39':
  Calculate audio media drift time from AudioSource