AudioParams with automations must process timelines

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

 /*
  * Copyright (C) 2011, 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 33 matching lines @@
       m_detune(AudioParam::create(context, ParamTypeBiquadFilterDetune, 0.0)) {
   setHandler(AudioBasicProcessorHandler::create(
       AudioHandler::NodeTypeBiquadFilter, *this, context.sampleRate(),
       WTF::wrapUnique(new BiquadProcessor(
           context.sampleRate(), 1, m_frequency->handler(), m_q->handler(),
           m_gain->handler(), m_detune->handler()))));
 
   // Explicitly set the filter type so that any histograms get updated with the
   // default value.  Otherwise, the histogram won't ever show it.
   setType("lowpass");
+
+  // Initialize the handler so that AudioParams can be processed.
+  handler().initialize();
 }
 
 BiquadFilterNode* BiquadFilterNode::create(BaseAudioContext& context,
                                            ExceptionState& exceptionState) {
   DCHECK(isMainThread());
 
   if (context.isContextClosed()) {
     context.throwExceptionForClosedState(exceptionState);
     return nullptr;
   }
@@ skipping 112 matching lines @@
   DCHECK(phaseResponse);
 
   int n = std::min(frequencyHz->length(),
                    std::min(magResponse->length(), phaseResponse->length()));
   if (n)
     getBiquadProcessor()->getFrequencyResponse(
         n, frequencyHz->data(), magResponse->data(), phaseResponse->data());
 }
 
 }  // namespace blink