Merge "Implement audio routing callbacks" into mnc-dev

core/jni/Android.mk

core/jni/android_media_AudioRecord.cpp

core/jni/android_media_AudioSystem.cpp

core/jni/android_media_AudioTrack.cpp

core/jni/android_media_DeviceCallback.cpp

core/jni/android_media_DeviceCallback.h

media/java/android/media/AudioDevicePort.java

media/java/android/media/AudioDevicesManager.java

media/java/android/media/AudioManager.java

media/java/android/media/AudioMixPort.java

media/java/android/media/AudioPort.java

media/java/android/media/AudioRecord.java

media/java/android/media/AudioSystem.java

media/java/android/media/AudioTrack.java