Revert of media: add video capture device for ARC++ camera HAL v3

media/capture/video/chromeos/display_rotation_observer.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_CAPTURE_VIDEO_CHROMEOS_DISPLAY_ROTATION_OBSERVER_H_
-#define MEDIA_CAPTURE_VIDEO_CHROMEOS_DISPLAY_ROTATION_OBSERVER_H_
-
-#include "base/memory/ref_counted.h"
-#include "base/single_thread_task_runner.h"
-#include "ui/display/display.h"
-#include "ui/display/display_observer.h"
-#include "ui/display/screen.h"
-
-namespace media {
-
-class DisplayRotationObserver {
- public:
-  virtual void SetDisplayRotation(const display::Display& display) = 0;
-};
-
-// Registers itself as an observer at |display::Screen::GetScreen()| and
-// forwards rotation change events to the given DisplayRotationObserver on the
-// thread where ScreenObserverDelegate was created.
-class ScreenObserverDelegate
-    : public display::DisplayObserver,
-      public base::RefCountedThreadSafe<ScreenObserverDelegate> {
- public:
-  ScreenObserverDelegate(
-      DisplayRotationObserver* observer,
-      scoped_refptr<base::SingleThreadTaskRunner> display_task_runner);
-
-  // The user must call RemoveObserver() to drop the reference to |observer_| in
-  // ScreenObserverDelegate before deleting |observer_|.
-  void RemoveObserver();
-
- private:
-  friend class base::RefCountedThreadSafe<ScreenObserverDelegate>;
-
-  ~ScreenObserverDelegate() override;
-
-  // DisplayObserver implementations.
-  void OnDisplayAdded(const display::Display& /*new_display*/) override;
-  void OnDisplayRemoved(const display::Display& /*old_display*/) override;
-  void OnDisplayMetricsChanged(const display::Display& display,
-                               uint32_t metrics) override;
-
-  void AddObserverOnDisplayThread();
-  void RemoveObserverOnDisplayThread();
-
-  // Post the screen rotation change from the display thread to capture thread
-  void SendDisplayRotation(const display::Display& display);
-  void SendDisplayRotationOnCaptureThread(const display::Display& display);
-
-  DisplayRotationObserver* observer_;
-  // The task runner where the calls to display::Display must be serialized on.
-  const scoped_refptr<base::SingleThreadTaskRunner> display_task_runner_;
-  // The task runner on which the ScreenObserverDelegate is created.
-  const scoped_refptr<base::SingleThreadTaskRunner> delegate_task_runner_;
-  DISALLOW_IMPLICIT_CONSTRUCTORS(ScreenObserverDelegate);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_CAPTURE_VIDEO_CHROMEOS_DISPLAY_ROTATION_OBSERVER_H_