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

media/audio/cras/audio_manager_cras.h

 // Copyright 2013 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_CRAS_AUDIO_MANAGER_CRAS_H_
 #define MEDIA_AUDIO_CRAS_AUDIO_MANAGER_CRAS_H_
 
 #include <cras_types.h>
 
 #include <string>
@@ skipping 34 matching lines @@
       const AudioParameters& params,
       const std::string& device_id,
       const LogCallback& log_callback) override;
   AudioInputStream* MakeLowLatencyInputStream(
       const AudioParameters& params,
       const std::string& device_id,
       const LogCallback& log_callback) override;
 
   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;
 
   AudioParameters GetPreferredOutputStreamParameters(
       const std::string& output_device_id,
       const AudioParameters& input_params) override;
 
  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,
                                     const std::string& device_id);
 
   void GetAudioDeviceNamesImpl(bool is_input, AudioDeviceNames* device_names);
 
   void AddBeamformingDevices(AudioDeviceNames* device_names);
 
   // Stores the mic positions field from the device.
   std::vector<Point> mic_positions_;
 
   const char* beamforming_on_device_id_;
   const char* beamforming_off_device_id_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioManagerCras);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_CRAS_AUDIO_MANAGER_CRAS_H_