[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.
Merge pull request #193 from t-nelson/audiotrack

Readable JNI