[DROID][AE] Rewrite AudioTrack sink using pull model
[DROID][JNI] Add AudioFormat class bits.
[DROID][JNI] Add AudioTrack class bits.
[DROID][JNI] Expose constant from AudioManager.

We need it for AudioTrack sink.
[DROID][AE] Replace raw JNI with CJNIAudioTrack.
[AE] Add comparison operator to AEAudioFormat
[DROID][AE] Only restart the sink when necessary.
Merge pull request #3823 from t-nelson/audiotrack_improvements

[DROID][AE] Audiotrack sink improvements