Output silence if the MediaElementAudioSourceNode has a different origin

Source/modules/webaudio/AudioContext.h

Index: Source/modules/webaudio/AudioContext.h
diff --git a/Source/modules/webaudio/AudioContext.h b/Source/modules/webaudio/AudioContext.h
index 7efdd5e33d729c7577f1f85b7bfdc69a9efd2b23..bdedbe921f43e39e3e3fd658ece33da66dfafff8 100644
--- a/Source/modules/webaudio/AudioContext.h
+++ b/Source/modules/webaudio/AudioContext.h
@@ -67,6 +67,7 @@ class OscillatorNode;
 class PannerNode;
 class PeriodicWave;
 class ScriptProcessorNode;
+class SecurityOrigin;
 class WaveShaperNode;
 
 // AudioContext is the cornerstone of the web audio API and all AudioNodes are created from it.
@@ -235,6 +236,9 @@ public:
 
     static unsigned s_hardwareContextCount;
 
+    // Get the security origin for this audio context.
+    PassRefPtr<SecurityOrigin> securityOrigin() const;
+
 protected:
     explicit AudioContext(Document*);
     AudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);