Make AudioParameters a class instead of a struct

content/renderer/media/render_audiosourceprovider.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.
 //
 // RenderAudioSourceProvider provides a bridge between classes:
 //     WebKit::WebAudioSourceProvider <---> media::AudioRendererSink
 //
 // RenderAudioSourceProvider is a "sink" of audio, and uses a default
 // AudioDevice if a client has not explicitly been set.
 //
@@ skipping 41 matching lines @@
   virtual void provideInput(const WebKit::WebVector<float*>& audio_data,
                             size_t number_of_frames);
 
   // AudioRendererSink implementation.
   virtual void Start() OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual void Play() OVERRIDE;
   virtual void Pause(bool flush) OVERRIDE;
   virtual bool SetVolume(double volume) OVERRIDE;
   virtual void GetVolume(double* volume) OVERRIDE;
-  virtual void Initialize(size_t buffer_size,
-                          int channels,
-                          double sample_rate,
-                          AudioParameters::Format latency_format,
-                          RenderCallback* renderer) OVERRIDE;
+  virtual void Initialize(
+      const AudioParameters& params, RenderCallback* renderer) OVERRIDE;
 
  private:
   // Set to true when Initialize() is called.
   bool is_initialized_;
   int channels_;
-  double sample_rate_;
+  int sample_rate_;
 
   bool is_running_;
   double volume_;
   media::AudioRendererSink::RenderCallback* renderer_;
   WebKit::WebAudioSourceProviderClient* client_;
 
   // Protects access to sink_
   base::Lock sink_lock_;
 
   // default_sink_ is the default sink.
   scoped_refptr<media::AudioRendererSink> default_sink_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderAudioSourceProvider);
 };
 
 #endif  // CONTENT_RENDERER_MEDIA_RENDER_AUDIOSOURCEPROVIDER_H_