Made AudioNode an EventTarget

Source/modules/webaudio/AudioNode.h

Index: Source/modules/webaudio/AudioNode.h
diff --git a/Source/modules/webaudio/AudioNode.h b/Source/modules/webaudio/AudioNode.h
index 8099081df79065a1519bcd8d92b0d7612e1a3528..baec89d7805526f2b004df450fe7297dfc560caa 100644
--- a/Source/modules/webaudio/AudioNode.h
+++ b/Source/modules/webaudio/AudioNode.h
@@ -26,6 +26,7 @@
 #define AudioNode_h
 
 #include "AudioBus.h"
+#include "EventTarget.h"
 #include <wtf/Forward.h>
 #include <wtf/OwnPtr.h>
 #include <wtf/PassOwnPtr.h>
@@ -49,7 +50,7 @@ typedef int ExceptionCode;
 // An AudioDestinationNode has one input and no outputs and represents the final destination to the audio hardware.
 // Most processing nodes such as filters will have one input and one output, although multiple inputs and outputs are possible.
 
-class AudioNode {
+class AudioNode : public EventTarget {
 public:
     enum { ProcessingSizeInFrames = 128 };
 
@@ -152,7 +153,7 @@ public:
     // tailTime() is the length of time (not counting latency time) where non-zero output may occur after continuous silent input.
     virtual double tailTime() const = 0;
     // latencyTime() is the length of time it takes for non-zero output to appear after non-zero input is provided. This only applies to
-    // processing delay which is an artifact of the processing algorithm chosen and is *not* part of the intrinsic desired effect. For 
+    // processing delay which is an artifact of the processing algorithm chosen and is *not* part of the intrinsic desired effect. For
     // example, a "delay" effect is expected to delay the signal, and thus would not be considered latency.
     virtual double latencyTime() const = 0;
 
@@ -180,11 +181,17 @@ public:
     ChannelCountMode internalChannelCountMode() const { return m_channelCountMode; }
     AudioBus::ChannelInterpretation internalChannelInterpretation() const { return m_channelInterpretation; }
 
+    // EventTarget
+    virtual const AtomicString& interfaceName() const OVERRIDE;
+    virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE;
+    virtual EventTargetData* eventTargetData() OVERRIDE { return &m_eventTargetData; }
+    virtual EventTargetData* ensureEventTargetData() OVERRIDE { return &m_eventTargetData; }
+
 protected:
     // Inputs and outputs must be created before the AudioNode is initialized.
     void addInput(PassOwnPtr<AudioNodeInput>);
     void addOutput(PassOwnPtr<AudioNodeOutput>);
-    
+
     // Called by processIfNecessary() to cause all parts of the rendering graph connected to us to process.
     // Each rendering quantum, the audio data for each of the AudioNode's inputs will be available after this method is called.
     // Called from context's audio thread.
@@ -201,13 +208,15 @@ private:
     Vector<OwnPtr<AudioNodeInput> > m_inputs;
     Vector<OwnPtr<AudioNodeOutput> > m_outputs;
 
+    EventTargetData m_eventTargetData;
+
     double m_lastProcessingTime;
     double m_lastNonSilentTime;
 
     // Ref-counting
     volatile int m_normalRefCount;
     volatile int m_connectionRefCount;
-    
+
     bool m_isMarkedForDeletion;
     bool m_isDisabled;
 
@@ -216,6 +225,9 @@ private:
     static int s_nodeCount[NodeTypeEnd];
 #endif
 
+    virtual void refEventTarget() OVERRIDE { ref(); }
+    virtual void derefEventTarget() OVERRIDE { deref(); }
+
 protected:
     unsigned m_channelCount;
     ChannelCountMode m_channelCountMode;