[DO NOT SUBMIT] AudioWorklet FS2: audio thread

third_party/WebKit/Source/platform/audio/AudioIOCallback.h

Index: third_party/WebKit/Source/platform/audio/AudioIOCallback.h
diff --git a/third_party/WebKit/Source/platform/audio/AudioIOCallback.h b/third_party/WebKit/Source/platform/audio/AudioIOCallback.h
index fa59684f66c231fd34a3636697bb88941bb62862..41eacc2b35b4d88475d341d21139c5ae234ff751 100644
--- a/third_party/WebKit/Source/platform/audio/AudioIOCallback.h
+++ b/third_party/WebKit/Source/platform/audio/AudioIOCallback.h
@@ -33,14 +33,16 @@ namespace blink {
 
 class AudioBus;
 
-// Abstract base-class for isochronous audio I/O client.
+// Abstract base-class for isochronous render. (e.g. AudioDestinationNode)
 class AudioIOCallback {
-public:
-    // render() is called periodically to get the next render quantum of audio into destinationBus.
-    // Optional audio input is given in sourceBus (if it's not 0).
-    virtual void render(AudioBus* sourceBus, AudioBus* destinationBus, size_t framesToProcess) = 0;
 
+public:
     virtual ~AudioIOCallback() { }
+
+    // render() is called periodically to get the next render quantum of audio
+    // into the destination bus. Optional external audio input is given in the
+    // source bus. (e.g. live audio input)
+    virtual void render(AudioBus* source, AudioBus* destination, size_t framesToProcess) = 0;
 };
 
 } // namespace blink