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

media/capture/video/linux/video_capture_device_chromeos.h

 // Copyright 2014 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_LINUX_VIDEO_CAPTURE_DEVICE_CHROMEOS_H_
 #define MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_CHROMEOS_H_
 
 #include "base/macros.h"
 #include "base/single_thread_task_runner.h"
+#include "media/capture/video/chromeos/display_rotation_observer.h"
 #include "media/capture/video/linux/camera_config_chromeos.h"
 #include "media/capture/video/linux/video_capture_device_linux.h"
 
 namespace display {
 class Display;
 }  // namespace display
 
 namespace media {
 
 // This class is functionally the same as VideoCaptureDeviceLinux, with the
 // exception that it is aware of the orientation of the internal Display.  When
 // the internal Display is rotated, the frames captured are rotated to match.
-class VideoCaptureDeviceChromeOS : public VideoCaptureDeviceLinux {
+class VideoCaptureDeviceChromeOS : public VideoCaptureDeviceLinux,
+                                   public DisplayRotationObserver {
  public:
   explicit VideoCaptureDeviceChromeOS(
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
       const VideoCaptureDeviceDescriptor& device_descriptor);
   ~VideoCaptureDeviceChromeOS() override;
 
  protected:
   void SetRotation(int rotation) override;
 
  private:
-  class ScreenObserverDelegate;
-
-  void SetDisplayRotation(const display::Display& display);
+  // DisplayRotationObserver implementation.
+  void SetDisplayRotation(const display::Display& display) override;
   scoped_refptr<ScreenObserverDelegate> screen_observer_delegate_;
   const VideoFacingMode lens_facing_;
   const int camera_orientation_;
   // Whether the incoming frames should rotate when the device rotates.
   const bool rotates_with_device_;
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceChromeOS);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CAPTURE_VIDEO_LINUX_VIDEO_CAPTURE_DEVICE_CHROMEOS_H_