Revert CL 2242573002

third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.h

Index: third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.h
diff --git a/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.h b/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.h
index 857e088c1869fe7b569889d0acdd13ddb13ef6a8..afd32cce61f69cb488854e616abac03fc702dfd4 100644
--- a/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.h
+++ b/third_party/WebKit/Source/modules/webaudio/DeferredTaskHandler.h
@@ -161,6 +161,8 @@ public:
 private:
     DeferredTaskHandler();
     void updateAutomaticPullNodes();
+    void updateChangedChannelCountMode();
+    void updateChangedChannelInterpretation();
     void handleDirtyAudioSummingJunctions();
     void handleDirtyAudioNodeOutputs();
     void deleteHandlersOnMainThread();
@@ -174,6 +176,13 @@ private:
     // m_automaticPullNodesNeedUpdating keeps track if m_automaticPullNodes is modified.
     bool m_automaticPullNodesNeedUpdating;
 
+    // Collection of nodes where the channel count mode has changed. We want the
+    // channel count mode to change in the pre- or post-rendering phase so as
+    // not to disturb the running audio thread.
+    HashSet<AudioHandler*> m_deferredCountModeChange;
+
+    HashSet<AudioHandler*> m_deferredChannelInterpretationChange;
+
     // These two HashSet must be accessed only when the graph lock is held.
     // These raw pointers are safe because their destructors unregister them.
     HashSet<AudioSummingJunction*> m_dirtySummingJunctions;