Avoid slow AudioParam automation path when possible

third_party/WebKit/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 121 matching lines @@
     // Value smoothing:
 
     // When a new value is set with setValue(), in our internal use of the parameter we don't immediately jump to it.
     // Instead we smoothly approach this value to avoid glitching.
     float smoothedValue();
 
     // Smoothly exponentially approaches to (de-zippers) the desired value.
     // Returns true if smoothed value has already snapped exactly to value.
     bool smooth();
 
-    void resetSmoothedValue() { m_smoothedValue = intrinsicValue(); }
+    void resetSmoothedValue() { m_timeline.setSmoothedValue(intrinsicValue()); }
 
     bool hasSampleAccurateValues() { return m_timeline.hasValues() || numberOfRenderingConnections(); }
 
     // 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&);
@@ skipping 21 matching lines @@
     // Intrinsic value
     float m_intrinsicValue;
     void setIntrinsicValue(float newValue);
 
     float m_defaultValue;
 
     // Nominal range for the value
     float m_minValue;
     float m_maxValue;
 
-    // Smoothing (de-zippering)
-    float m_smoothedValue;
-
     AudioParamTimeline m_timeline;
 
     // The destination node used to get necessary information like the smaple rate and context time.
     RefPtr<AudioDestinationHandler> m_destinationHandler;
 };
 
 // AudioParam class represents web-exposed AudioParam interface.
 class AudioParam final : public GarbageCollectedFinalized<AudioParam>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
@@ skipping 29 matching lines @@
 
     void warnIfOutsideRange(const String& paramMethd, float value);
 
     RefPtr<AudioParamHandler> m_handler;
     Member<AbstractAudioContext> m_context;
 };
 
 } // namespace blink
 
 #endif // AudioParam_h