AudioParams with automations must process timelines

third_party/WebKit/Source/modules/webaudio/AudioNode.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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 312 matching lines @@
     pullInputs(framesToProcess);
 
     bool silentInputs = inputsAreSilent();
     if (!silentInputs)
       m_lastNonSilentTime =
           (context()->currentSampleFrame() + framesToProcess) /
           static_cast<double>(m_sampleRate);
 
     if (silentInputs && propagatesSilence()) {
       silenceOutputs();
+      // AudioParams still need to be processed so that the value can be updated
+      // if there are automations or so that the upstream nodes get pulled if
+      // any are connected to the AudioParam.
+      processOnlyAudioParams(framesToProcess);
     } else {
       // Unsilence the outputs first because the processing of the node may
       // cause the outputs to go silent and we want to propagate that hint to
       // the downstream nodes.  (For example, a Gain node with a gain of 0 will
       // want to silence its output.)
       unsilenceOutputs();
       process(framesToProcess);
     }
   }
 }
@@ skipping 600 matching lines @@
 }
 
 void AudioNode::didAddOutput(unsigned numberOfOutputs) {
   m_connectedNodes.push_back(nullptr);
   DCHECK_EQ(numberOfOutputs, m_connectedNodes.size());
   m_connectedParams.push_back(nullptr);
   DCHECK_EQ(numberOfOutputs, m_connectedParams.size());
 }
 
 }  // namespace blink