Switching VirtualKeyboardPrivate keyboard config call stack to receive HasInputDevices() responce a…

media/audio/audio_system_impl.h

 // Copyright 2017 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_AUDIO_SYSTEM_IMPL_H_
 #define MEDIA_AUDIO_AUDIO_SYSTEM_IMPL_H_
 
 #include "media/audio/audio_system.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace media {
 class AudioManager;
 
 class MEDIA_EXPORT AudioSystemImpl : public AudioSystem {
  public:
   static std::unique_ptr<AudioSystem> Create(AudioManager* audio_manager);
 
   ~AudioSystemImpl() override;
 
   // AudioSystem implementation.
   void GetInputStreamParameters(
       const std::string& device_id,
       OnAudioParamsCallback on_params_cb) const override;
+  void HasInputDevices(OnBoolCallback on_has_devices_cb) const override;
   AudioManager* GetAudioManager() const override;
 
  protected:
   AudioSystemImpl(AudioManager* audio_manager);
 
  private:
   base::SingleThreadTaskRunner* GetTaskRunner() const;
 
   AudioManager* const audio_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioSystemImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_SYSTEM_IMPL_H_