Revert "chromeos: Move files in //ash/common to //ash, part 3"

ash/media_controller.h

-// Copyright 2016 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 ASH_MEDIA_CONTROLLER_H_
-#define ASH_MEDIA_CONTROLLER_H_
-
-#include "ash/public/interfaces/media.mojom.h"
-#include "base/macros.h"
-#include "base/observer_list.h"
-#include "mojo/public/cpp/bindings/associated_binding.h"
-#include "mojo/public/cpp/bindings/binding_set.h"
-
-namespace ash {
-
-// Forwards notifications from the MediaController to observers.
-class MediaCaptureObserver {
- public:
-  // Called when media capture state has changed.
-  virtual void OnMediaCaptureChanged(
-      const std::vector<mojom::MediaCaptureState>& capture_states) = 0;
-
- protected:
-  virtual ~MediaCaptureObserver() {}
-};
-
-// Provides the MediaController interface to the outside world. This lets a
-// consumer of ash provide a MediaClient, which we will dispatch to if one has
-// been provided to us.
-class MediaController : public mojom::MediaController,
-                        public mojom::MediaClient {
- public:
-  MediaController();
-  ~MediaController() override;
-
-  void BindRequest(mojom::MediaControllerRequest request);
-
-  void AddObserver(MediaCaptureObserver* observer);
-  void RemoveObserver(MediaCaptureObserver* observer);
-
-  // mojom::MediaClient:
-  void HandleMediaNextTrack() override;
-  void HandleMediaPlayPause() override;
-  void HandleMediaPrevTrack() override;
-  void RequestCaptureState() override;
-
- private:
-  friend class MultiProfileMediaTrayItemTest;
-
-  // mojom::MediaController:
-  void SetClient(mojom::MediaClientAssociatedPtrInfo client) override;
-  void NotifyCaptureState(
-      const std::vector<mojom::MediaCaptureState>& capture_states) override;
-
-  mojo::BindingSet<mojom::MediaController> bindings_;
-
-  mojom::MediaClientAssociatedPtr client_;
-
-  base::ObserverList<MediaCaptureObserver> observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaController);
-};
-
-}  // namespace ash
-
-#endif  // ASH_MEDIA_CONTROLLER_H_