Make reduction value of dynamics compressor zero when no sources are connected

Source/modules/webaudio/DynamicsCompressorNode.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 90 matching lines @@
 
 void DynamicsCompressorNode::uninitialize()
 {
     if (!isInitialized())
         return;
 
     m_dynamicsCompressor.clear();
     AudioNode::uninitialize();
 }
 
+void DynamicsCompressorNode::clearInternalStateWhenDisabled()
+{
+    m_reduction->setValue(0);
+}
+
 double DynamicsCompressorNode::tailTime() const
 {
     return m_dynamicsCompressor->tailTime();
 }
 
 double DynamicsCompressorNode::latencyTime() const
 {
     return m_dynamicsCompressor->latencyTime();
 }
 
 void DynamicsCompressorNode::trace(Visitor* visitor)
 {
     visitor->trace(m_threshold);
     visitor->trace(m_knee);
     visitor->trace(m_ratio);
     visitor->trace(m_reduction);
     visitor->trace(m_attack);
     visitor->trace(m_release);
     AudioNode::trace(visitor);
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)