ChromeOS: enable pinning stream output routing for webapp request [extracted from 2516813002]

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 ddf0aace204e998ae5d33a14088a3cdb9ce7d0f8..bafe7829b89f3594325559c346fb87598db417ee 100644
--- a/media/audio/cras/audio_manager_cras.h
+++ b/media/audio/cras/audio_manager_cras.h
@@ -52,6 +52,9 @@ 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.

[tommi (sloooow) - chröme, 2017/01/25 22:05:28]

nit: 

// Checks if |device_id| corresponds to the default device.
// Set |is_input| to true for capture devices, false for output.

[Qiang(Joe) Xu, 2017/01/25 22:50:18]

Done.

+  bool IsDefault(const std::string& device_id, bool is_input);
+
  protected:
   ~AudioManagerCras() override;
 
@@ -61,7 +64,8 @@ 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,