Output silence if the MediaElementAudioSourceNode has a different origin

Source/modules/webaudio/AudioContext.h

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 52 matching lines @@
 class ExceptionState;
 class GainNode;
 class HTMLMediaElement;
 class MediaElementAudioSourceNode;
 class MediaStreamAudioDestinationNode;
 class MediaStreamAudioSourceNode;
 class OscillatorNode;
 class PannerNode;
 class PeriodicWave;
 class ScriptProcessorNode;
+class SecurityOrigin;
 class StereoPannerNode;
 class WaveShaperNode;
 
 // AudioContext is the cornerstone of the web audio API and all AudioNodes are created from it.
 // For thread safety between the audio thread and the main thread, it has a rendering graph locking mechanism.
 
 class AudioContext : public RefCountedGarbageCollectedEventTargetWithInlineData<AudioContext>, public ActiveDOMObject {
     DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCountedGarbageCollected<AudioContext>);
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AudioContext);
     DEFINE_WRAPPERTYPEINFO();
@@ skipping 177 matching lines @@
     void notifyStateChange();
 
     // The context itself keeps a reference to all source nodes.  The source nodes, then reference all nodes they're connected to.
     // In turn, these nodes reference all nodes they're connected to.  All nodes are ultimately connected to the AudioDestinationNode.
     // When the context dereferences a source node, it will be deactivated from the rendering graph along with all other nodes it is
     // uniquely connected to.  See the AudioNode::ref() and AudioNode::deref() methods for more details.
     void refNode(AudioNode*);
 
     static unsigned s_hardwareContextCount;
 
+    // Get the security origin for this audio context.
+    SecurityOrigin* securityOrigin() const;
+
 protected:
     explicit AudioContext(Document*);
     AudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
 
     RefPtrWillBeMember<ScriptPromiseResolver> m_offlineResolver;
 private:
     void initialize();
     void uninitialize();
 
     // ExecutionContext calls stop twice.
@@ skipping 133 matching lines @@
     void handleStoppableSourceNodes();
 
     // This is considering 32 is large enough for multiple channels audio.
     // It is somewhat arbitrary and could be increased if necessary.
     enum { MaxNumberOfChannels = 32 };
 };
 
 } // namespace blink
 
 #endif // AudioContext_h