Web Audio: when media playback requires a user gesture, apply rule to cross origin iframes.

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

Index: third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
diff --git a/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h b/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
index 585dec1f71edfef74b2d750455901d5eb155803e..dffa88dddc7780eb21bedc1c39b6de39955a1155 100644
--- a/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
+++ b/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
@@ -262,10 +262,12 @@ public:
     // if necessary.
     PeriodicWave* periodicWave(int type);
 
-    // Check whether the AudioContext requires a user gesture and whether the
-    // current stack is processing user gesture and record these information in
-    // a histogram.
-    void recordUserGestureState();
+    // Called by AudioContext nodes to start the AudioContext when it is
+    // suspended because of gesture requirement.
+    // It will be a no-op if:
+    // - no user gesture is required, or
+    // - a user gesture is required but none was provided.
+    void startRenderingIfNeeded();
 
 protected:
     explicit BaseAudioContext(Document*);