Continue to process AnalyserNode if inputs are silent.

third_party/WebKit/Source/modules/webaudio/AudioBasicInspectorNode.h

 /*
  * Copyright (C) 2012, Intel Corporation. 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 32 matching lines @@
  public:
   AudioBasicInspectorHandler(NodeType,
                              AudioNode&,
                              float sampleRate,
                              unsigned outputChannelCount);
 
   // AudioHandler
   void pullInputs(size_t framesToProcess) final;
   void checkNumberOfChannelsForInput(AudioNodeInput*) final;
 
-  void updatePullStatus();
+  virtual void updatePullStatus();
 
- private:
+ protected:
   // When setting to true, AudioBasicInspectorHandler will be pulled
   // automaticlly by BaseAudioContext before the end of each render quantum.
   bool m_needAutomaticPull;
 };
 
 class AudioBasicInspectorNode : public AudioNode {
  protected:
   explicit AudioBasicInspectorNode(BaseAudioContext& context)
       : AudioNode(context) {}
 
  private:
   // TODO(tkent): Should AudioBasicInspectorNode override other variants of
   // connect() and disconnect()?
   AudioNode* connect(AudioNode*,
                      unsigned outputIndex,
                      unsigned inputIndex,
                      ExceptionState&) final;
   void disconnect(unsigned outputIndex, ExceptionState&) final;
 };
 
 }  // namespace blink
 
 #endif  // AudioBasicInspectorNode_h