Assert destination handler exists in AudioParam

third_party/WebKit/Source/modules/webaudio/AudioParam.cpp

 /*
  * 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 17 matching lines @@
 #include "modules/webaudio/AudioNodeOutput.h"
 #include "platform/FloatConversion.h"
 #include "platform/audio/AudioUtilities.h"
 #include "wtf/MathExtras.h"
 
 namespace blink {
 
 const double AudioParamHandler::DefaultSmoothingConstant = 0.05;
 const double AudioParamHandler::SnapThreshold = 0.001;
 
+AudioParamHandler::AudioParamHandler(AbstractAudioContext& context, AudioParamType paramType, double defaultValue)
+    : AudioSummingJunction(context.deferredTaskHandler())
+    , m_paramType(paramType)
+    , m_intrinsicValue(defaultValue)
+    , m_defaultValue(defaultValue)
+    , m_smoothedValue(defaultValue)
+{
+    // The destination MUST exist because we need the destination handler for the AudioParam.
+    RELEASE_ASSERT(context.destination());
+
+    m_destinationHandler = &context.destination()->audioDestinationHandler();
+}
+
 AudioDestinationHandler& AudioParamHandler::destinationHandler() const
 {
     return *m_destinationHandler;
 }
 
 String AudioParamHandler::getParamName() const
 {
     // The returned string should be the name of the node and the name of the AudioParam for
     // that node.
     switch (m_paramType) {
@@ skipping 251 matching lines @@
 }
 
 AudioParam* AudioParam::cancelScheduledValues(double startTime, ExceptionState& exceptionState)
 {
     handler().timeline().cancelScheduledValues(startTime, exceptionState);
     return this;
 }
 
 } // namespace blink