AudioTrack comments and range checks
AudioTrack comments and range checks

Added range checks for setPlaybackHeadPosition and setLoopPoints to
correspond to the new implementation.  The checks are not expected to
cause any significant incompatibilities for real apps.

Change-Id: Ia52723419e7d0e2c561a0d1eeb8f36a5376c4e03

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