Detect AudioInputStream muting and propagate to MediaStreamAudioSource.

content/browser/speech/speech_recognizer_impl.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_H_
 #define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 130 matching lines @@
 
   // Callback called on IO thread by audio_controller->Close().
   void OnAudioClosed(media::AudioInputController*);
 
   // AudioInputController::EventHandler methods.
   void OnCreated(media::AudioInputController* controller) override {}
   void OnError(media::AudioInputController* controller,
                media::AudioInputController::ErrorCode error_code) override;
   void OnLog(media::AudioInputController* controller,
              const std::string& message) override {}
+  void OnMuted(media::AudioInputController* controller,
+               bool is_muted) override {}
 
   // AudioInputController::SyncWriter methods.
   void Write(const media::AudioBus* data,
              double volume,
              bool key_pressed,
              uint32_t hardware_delay_bytes) override;
   void Close() override;
 
   // SpeechRecognitionEngineDelegate methods.
   void OnSpeechRecognitionEngineResults(
@@ skipping 29 matching lines @@
   // output format.
   std::unique_ptr<SpeechRecognizerImpl::OnDataConverter> audio_converter_;
 
   base::WeakPtrFactory<SpeechRecognizerImpl> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(SpeechRecognizerImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNIZER_IMPL_H_