On windows, create PCMWaveInAudioInputStream instance with correct device ID.

media/audio/win/wavein_input_win.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_WIN_WAVEIN_INPUT_WIN_H_
 #define MEDIA_AUDIO_WIN_WAVEIN_INPUT_WIN_H_
 
 #include <windows.h>
 #include <mmsystem.h>
 
@@ skipping 29 matching lines @@
  private:
   enum State {
     kStateEmpty,      // Initial state.
     kStateReady,      // Device obtained and ready to record.
     kStateRecording,  // Recording audio.
     kStateStopping,   // Trying to stop, waiting for callback to finish.
     kStateStopped,    // Stopped. Device was reset.
     kStateClosed      // Device has been released.
   };
 
+  // Allow unit tests to query the device ID.
+  friend class AudioInputDeviceTest;
+
   // Windows calls us back with the recorded audio data here. See msdn
   // documentation for 'waveInProc' for details about the parameters.
   static void CALLBACK WaveCallback(HWAVEIN hwi, UINT msg, DWORD_PTR instance,
                                     DWORD_PTR param1, DWORD_PTR param2);
 
   // If windows reports an error this function handles it and passes it to
   // the attached AudioInputCallback::OnError().
   void HandleError(MMRESULT error);
 
   // Allocates and prepares the memory that will be used for recording.
@@ skipping 44 matching lines @@
   // Pointer to the first allocated audio buffer. This object owns it.
   WAVEHDR* buffer_;
 
   // An event that is signaled when the callback thread is ready to stop.
   base::win::ScopedHandle stopped_event_;
 
   DISALLOW_COPY_AND_ASSIGN(PCMWaveInAudioInputStream);
 };
 
 #endif  // MEDIA_AUDIO_WIN_WAVEIN_INPUT_WIN_H_