Enable pinning stream output routing for webapp request on ChromeOS

media/audio/cras/cras_input.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_CRAS_CRAS_INPUT_H_
 #define MEDIA_AUDIO_CRAS_CRAS_INPUT_H_
 
 #include <cras_client.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 31 matching lines @@
   bool Open() override;
   void Start(AudioInputCallback* callback) override;
   void Stop() override;
   void Close() override;
   double GetMaxVolume() override;
   void SetVolume(double volume) override;
   double GetVolume() override;
   bool IsMuted() override;
 
  private:
-  // Checks if |device_id| corresponds to 'Default' choice.
-  bool IsDefault(const std::string& device_id) const;
-
   // Handles requests to get samples from the provided buffer.  This will be
   // called by the audio server when it has samples ready.
   static int SamplesReady(cras_client* client,
                           cras_stream_id_t stream_id,
                           uint8_t* samples,
                           size_t frames,
                           const timespec* sample_ts,
                           void* arg);
 
   // Handles notification that there was an error with the playback stream.
@@ skipping 54 matching lines @@
   bool mute_done_;
 
   std::unique_ptr<AudioBus> audio_bus_;
 
   DISALLOW_COPY_AND_ASSIGN(CrasInputStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_CRAS_CRAS_INPUT_H_