Enable pinning stream output routing for webapp request on ChromeOS

media/audio/cras/audio_manager_cras.h

Index: media/audio/cras/audio_manager_cras.h
diff --git a/media/audio/cras/audio_manager_cras.h b/media/audio/cras/audio_manager_cras.h
index ec739468cded323a4d69895d7980853379b04652..846b24bbd1a3070448393b1455f9032b09e049ae 100644
--- a/media/audio/cras/audio_manager_cras.h
+++ b/media/audio/cras/audio_manager_cras.h
@@ -51,6 +51,9 @@ class MEDIA_EXPORT AudioManagerCras : public AudioManagerBase {
 
   static snd_pcm_format_t BitsToFormat(int bits_per_sample);
 
+  // Checks if |device_id| corresponds to 'Default' |is_input| choice.
+  bool IsDefault(const std::string& device_id, bool is_input);
+
  protected:
   ~AudioManagerCras() override;
 
@@ -60,7 +63,8 @@ class MEDIA_EXPORT AudioManagerCras : public AudioManagerBase {
 
  private:
   // Called by MakeLinearOutputStream and MakeLowLatencyOutputStream.
-  AudioOutputStream* MakeOutputStream(const AudioParameters& params);
+  AudioOutputStream* MakeOutputStream(const AudioParameters& params,
+                                      const std::string& device_id);
 
   // Called by MakeLinearInputStream and MakeLowLatencyInputStream.
   AudioInputStream* MakeInputStream(const AudioParameters& params,