AI 146751: Finalize AudioTrack javadoc.   BUG=1795799
AI 146751: Finalize AudioTrack javadoc.
  BUG=1795799

Automated import of CL 146751

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base