Move business logic out of IAudioFlinger

IAudioFlinger should only contain transport logic, in preparation for
AIDL conversion.

Test: Audio-related CTS tests from CtsMediaTestCases
Change-Id: I2a6d8f16da720a3db7c673e5b2bb9bbd23bbf985
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 6dfc48f..a2e50f8 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -519,6 +519,7 @@
     const sp<MediaLogNotifier> mMediaLogNotifier;
 
     // This is a helper that is called during incoming binder calls.
+    // Requests media.log to start merging log buffers
     void requestLogMerge();
 
     class TrackHandle;