Audio recording notification API

AudioService can register a recording callback with AudioSystem.
Callbacks are handled in a new class, RecordingActivityMonitor.
This class notifies registered AudioManager instances
  of updates, only if this AudioManager has client callbacks.
Each AudioManager dispatches updates to its registered
  callbacks.

Bug 22876530

Change-Id: I95c6e5ec0631e53af53a490bcecca96089490089
diff --git a/Android.mk b/Android.mk
index c1c74ea..b95ab2e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -345,6 +345,7 @@
 	media/java/android/media/IMediaRouterService.aidl \
 	media/java/android/media/IMediaScannerListener.aidl \
 	media/java/android/media/IMediaScannerService.aidl \
+	media/java/android/media/IRecordingConfigDispatcher.aidl \
 	media/java/android/media/IRemoteDisplayCallback.aidl \
 	media/java/android/media/IRemoteDisplayProvider.aidl \
 	media/java/android/media/IRemoteVolumeController.aidl \