Added initial muted state to stream creation callback, to avoid races.

media/base/audio_capturer_source.h

 // Copyright (c) 2012 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 MEDIA_BASE_AUDIO_CAPTURER_SOURCE_H_
 #define MEDIA_BASE_AUDIO_CAPTURER_SOURCE_H_
 
 #include <string>
 #include <vector>
 #include "base/memory/ref_counted.h"
@@ skipping 23 matching lines @@
     // TODO(chcunningham): Update delay argument to use frames instead of
     // milliseconds to prevent loss of precision. See http://crbug.com/587291.
     virtual void Capture(const AudioBus* audio_source,
                          int audio_delay_milliseconds,
                          double volume,
                          bool key_pressed) = 0;
 
     // Signals an error has occurred.
     virtual void OnCaptureError(const std::string& message) = 0;
 
-    // Signals the muted state has changed.
+    // Signals the muted state has changed. May be called before
+    // OnCaptureStarted.
     virtual void OnCaptureMuted(bool is_muted) = 0;
 
    protected:
     virtual ~CaptureCallback() {}
   };
 
   // Sets information about the audio stream format and the device
   // to be used. It must be called before any of the other methods.
   // The |session_id| is used by the browser to identify which input device to
   // be used. For clients who do not care about device permission and device
@@ skipping 17 matching lines @@
   virtual void SetAutomaticGainControl(bool enable) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<AudioCapturerSource>;
   virtual ~AudioCapturerSource() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_CAPTURER_SOURCE_H_