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

media/capture/video/linux/video_capture_device_chromeos.h

Index: media/capture/video/linux/video_capture_device_chromeos.h
diff --git a/media/capture/video/linux/video_capture_device_chromeos.h b/media/capture/video/linux/video_capture_device_chromeos.h
index b3ba70d3982188b6eb5b7b896a1980d1c79461c0..d9e738ed2f2a714b9086f391363a7b3fb8bdaa8b 100644
--- a/media/capture/video/linux/video_capture_device_chromeos.h
+++ b/media/capture/video/linux/video_capture_device_chromeos.h
@@ -7,6 +7,7 @@
 
 #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"
 
@@ -19,7 +20,8 @@ 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,
@@ -30,9 +32,8 @@ class VideoCaptureDeviceChromeOS : public VideoCaptureDeviceLinux {
   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_;