Add GetOutputStreamParameters, GetAssociatedOutputDeviceID to AudioManager.

media/audio/win/audio_low_latency_output_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.
 
 // Implementation of AudioOutputStream for Windows using Windows Core Audio
 // WASAPI for low latency rendering.
 //
 // Overview of operation and performance:
 //
 // - An object of WASAPIAudioOutputStream is created by the AudioManager
@@ skipping 131 matching lines @@
   static int HardwareChannelCount();
 
   // Retrieves the channel layout the audio engine uses for its internal
   // processing/mixing of shared-mode streams for the default endpoint device.
   // Note that we convert an internal channel layout mask (see ChannelMask())
   // into a Chrome-specific channel layout enumerator in this method, hence
   // the match might not be perfect.
   static ChannelLayout HardwareChannelLayout();
 
   // Retrieves the sample rate the audio engine uses for its internal
-  // processing/mixing of shared-mode streams for the default endpoint device.
-  static int HardwareSampleRate();
+  // processing/mixing of shared-mode streams.  To fetch the settings for the
+  // default device, pass an empty string as the |device_id|.
+  static int HardwareSampleRate(const std::string& device_id);
 
   // Returns AUDCLNT_SHAREMODE_EXCLUSIVE if --enable-exclusive-mode is used
   // as command-line flag and AUDCLNT_SHAREMODE_SHARED otherwise (default).
   static AUDCLNT_SHAREMODE GetShareMode();
 
   bool started() const { return render_thread_.get() != NULL; }
 
  private:
   // DelegateSimpleThread::Delegate implementation.
   virtual void Run() OVERRIDE;
@@ skipping 89 matching lines @@
 
   // Container for retrieving data from AudioSourceCallback::OnMoreData().
   scoped_ptr<AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(WASAPIAudioOutputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_OUTPUT_WIN_H_