Rotate frames correctly for back camera

media/capture/video/video_capture_device_client.h

Index: media/capture/video/video_capture_device_client.h
diff --git a/media/capture/video/video_capture_device_client.h b/media/capture/video/video_capture_device_client.h
index b36ebe5dd04245b972d4c7415d41b366f609c502..012bd5ad140aa8f4fed1495f3acee633e7330cbb 100644
--- a/media/capture/video/video_capture_device_client.h
+++ b/media/capture/video/video_capture_device_client.h
@@ -75,6 +75,7 @@ class CAPTURE_EXPORT VideoCaptureDeviceClient
                const std::string& reason) override;
   void OnLog(const std::string& message) override;
   double GetBufferPoolUtilization() const override;
+  void SetCameraFacing(bool is_back_camera) override;
 
  private:
   // Reserve output buffer into which I420 contents can be copied directly.
@@ -113,6 +114,9 @@ class CAPTURE_EXPORT VideoCaptureDeviceClient
   // The pool of shared-memory buffers used for capturing.
   const scoped_refptr<VideoCaptureBufferPool> buffer_pool_;
 
+  // Whether the capture device is back camera.
+  bool is_back_camera_;
+
 #if DCHECK_IS_ON()
   // Counter used to track the number of times consecutive capture buffers are
   // dropped.