Ensure both default audio device IDs are handled for creation.

media/audio/audio_output_proxy.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_AUDIO_AUDIO_OUTPUT_PROXY_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_PROXY_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ skipping 21 matching lines @@
   explicit AudioOutputProxy(AudioOutputDispatcher* dispatcher);
 
   // AudioOutputStream interface.
   bool Open() override;
   void Start(AudioSourceCallback* callback) override;
   void Stop() override;
   void SetVolume(double volume) override;
   void GetVolume(double* volume) override;
   void Close() override;
 
+  AudioOutputDispatcher* get_dispatcher_for_testing() const {
+    return dispatcher_.get();
+  }
+
  private:
   enum State {
     kCreated,
     kOpened,
     kPlaying,
     kClosed,
     kOpenError,
     kStartError,
   };
 
   ~AudioOutputProxy() override;
 
   scoped_refptr<AudioOutputDispatcher> dispatcher_;
   State state_;
 
   // Need to save volume here, so that we can restore it in case the stream
   // is stopped, and then started again.
   double volume_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioOutputProxy);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_PROXY_H_