Web Audio: Unapply Oilpan to AudioSummingJunction.

Source/modules/webaudio/AudioParam.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
@@ skipping 24 matching lines @@
 #include "modules/webaudio/AudioParamTimeline.h"
 #include "modules/webaudio/AudioSummingJunction.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/text/WTFString.h"
 #include <sys/types.h>
 
 namespace blink {
 
 class AudioNodeOutput;
 
-class AudioParamHandler final : public AudioSummingJunction, public ScriptWrappable {
+class AudioParamHandler final : public GarbageCollectedFinalized<AudioParamHandler>, public AudioSummingJunction, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static const double DefaultSmoothingConstant;
     static const double SnapThreshold;
 
     static AudioParamHandler* create(AudioContext* context, double defaultValue)
     {
         return new AudioParamHandler(context, defaultValue);
     }
+    DECLARE_TRACE();
+    AudioContext* context() const { return m_context; }
 
     // AudioSummingJunction
     virtual void didUpdate() override { }
 
     // Intrinsic value.
     float value();
     void setValue(float);
 
     // Final value for k-rate parameters, otherwise use calculateSampleAccurateValues() for a-rate.
     // Must be called in the audio thread.
@@ skipping 44 matching lines @@
     // Calculates numberOfValues parameter values starting at the context's current time.
     // Must be called in the context's render thread.
     void calculateSampleAccurateValues(float* values, unsigned numberOfValues);
 
     // Connect an audio-rate signal to control this parameter.
     void connect(AudioNodeOutput&);
     void disconnect(AudioNodeOutput&);
 
 private:
     AudioParamHandler(AudioContext* context, double defaultValue)
-        : AudioSummingJunction(context)
+        : AudioSummingJunction(context->handler())
         , m_value(defaultValue)
         , m_defaultValue(defaultValue)
-        , m_smoothedValue(defaultValue) { }
+        , m_smoothedValue(defaultValue)
+        , m_context(context) { }
 
     // sampleAccurate corresponds to a-rate (audio rate) vs. k-rate in the Web Audio specification.
     void calculateFinalValues(float* values, unsigned numberOfValues, bool sampleAccurate);
     void calculateTimelineValues(float* values, unsigned numberOfValues);
 
     double m_value;
     double m_defaultValue;
 
     // Smoothing (de-zippering)
     double m_smoothedValue;
 
     AudioParamTimeline m_timeline;
+    Member<AudioContext> m_context;
 };
 
 // TODO(tkent): remove the type alias, and introduce a real AudioParam class to
 // wrap AudioParamHandler.
 using AudioParam = AudioParamHandler;
 
 } // namespace blink
 
 #endif // AudioParam_h