Reland of rotate frames correctly for back camera

media/capture/video/linux/video_capture_device_linux.h

Index: media/capture/video/linux/video_capture_device_linux.h
diff --git a/media/capture/video/linux/video_capture_device_linux.h b/media/capture/video/linux/video_capture_device_linux.h
index e8adbde8df41715bdd075c0c921c3f6446eb4383..d8a543d27d607a558ef8050f46cd783d2c1140ab 100644
--- a/media/capture/video/linux/video_capture_device_linux.h
+++ b/media/capture/video/linux/video_capture_device_linux.h
@@ -45,7 +45,9 @@ class VideoCaptureDeviceLinux : public VideoCaptureDevice {
                        SetPhotoOptionsCallback callback) override;
 
  protected:
-  void SetRotation(int rotation);
+  virtual void SetRotation(int rotation);
+
+  const VideoCaptureDeviceDescriptor device_descriptor_;
 
  private:
   static int TranslatePowerLineFrequencyToV4L2(PowerLineFrequency frequency);
@@ -57,8 +59,6 @@ class VideoCaptureDeviceLinux : public VideoCaptureDevice {
 
   base::Thread v4l2_thread_;  // Thread used for reading data from the device.
 
-  const VideoCaptureDeviceDescriptor device_descriptor_;
-
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceLinux);
 };