Simplify notification of a dirty listener.

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

Index: third_party/WebKit/Source/modules/webaudio/AudioListener.h
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioListener.h b/third_party/WebKit/Source/modules/webaudio/AudioListener.h
index d41a614effea6d942aad989d83c2c411083d9495..457090e49fba4ab81d4d7727f33b6761916b0d7c 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioListener.h
+++ b/third_party/WebKit/Source/modules/webaudio/AudioListener.h
@@ -73,6 +73,8 @@ public:
     // PannerNodes if necessary.
     void updateState();
 
+    bool isListenerDirty() const { return m_isListenerDirty; }
+
     const FloatPoint3D position() const
     {
         return FloatPoint3D(
@@ -175,6 +177,11 @@ private:
     // Last time that the automations were updated.
     double m_lastUpdateTime;
 
+    // Set every rendering quantum if the listener has moved in any way
+    // (position, forward, or up).  This should only be read or written to from
+    // the audio thread.
+    bool m_isListenerDirty;
+
     void updateValuesIfNeeded(size_t framesToProcess);
 
     AudioFloatArray m_positionXValues;