Switching MediaStreamsManager from using AudioManager interface to AudioSystem one.

media/audio/mock_audio_manager.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_MOCK_AUDIO_MANAGER_H_
 #define MEDIA_AUDIO_MOCK_AUDIO_MANAGER_H_
 
+#include "base/callback.h"
 #include "base/macros.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "media/audio/audio_manager.h"
 
 namespace media {
 
 // This class is a simple mock around AudioManager, used exclusively for tests,
 // which avoids to use the actual (system and platform dependent) AudioManager.
 // Some bots does not have input devices, thus using the actual AudioManager
 // would causing failures on classes which expect that.
 class MockAudioManager : public AudioManager {
  public:
   class Deleter {
    public:
     void operator()(const MockAudioManager* instance) const;
   };
 
   using UniquePtr = std::unique_ptr<MockAudioManager, Deleter>;
+  using GetDeviceDescriptionsCallback =
+      base::RepeatingCallback<void(AudioDeviceDescriptions*)>;
 
   explicit MockAudioManager(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
 
   bool HasAudioOutputDevices() override;
 
   bool HasAudioInputDevices() override;
 
   base::string16 GetAudioInputDeviceModel() override;
 
@@ skipping 40 matching lines @@
   void DisableOutputDebugRecording() override;
 
   const char* GetName() override;
 
   // Setters to emulate desired in-test behavior.
   void SetInputStreamParameters(const AudioParameters& params);
   void SetOutputStreamParameters(const AudioParameters& params);
   void SetDefaultOutputStreamParameters(const AudioParameters& params);
   void SetHasInputDevices(bool has_input_devices);
   void SetHasOutputDevices(bool has_output_devices);
+  void SetInputDeviceDescriptionsCallback(
+      GetDeviceDescriptionsCallback callback);
+  void SetOutputDeviceDescriptionsCallback(
+      GetDeviceDescriptionsCallback callback);
 
  protected:
   ~MockAudioManager() override;
 
  private:
   friend class base::DeleteHelper<MockAudioManager>;
 
   AudioParameters input_params_;
   AudioParameters output_params_;
   AudioParameters default_output_params_;
   bool has_input_devices_ = true;
   bool has_output_devices_ = true;
+  GetDeviceDescriptionsCallback get_input_device_descriptions_cb_;
+  GetDeviceDescriptionsCallback get_output_device_descriptions_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(MockAudioManager);
 };
 
 }  // namespace media.
 
 #endif  // MEDIA_AUDIO_MOCK_AUDIO_MANAGER_H_