Rotate frames correctly for back camera

media/capture/video/video_capture_device.h

Index: media/capture/video/video_capture_device.h
diff --git a/media/capture/video/video_capture_device.h b/media/capture/video/video_capture_device.h
index 24d6c369231c653f492fe908dee0354a05d5c7b3..fd8c3dfbf977ab7a94f17470e0473e32436bf5ea 100644
--- a/media/capture/video/video_capture_device.h
+++ b/media/capture/video/video_capture_device.h
@@ -142,6 +142,8 @@ class CAPTURE_EXPORT VideoCaptureDevice {
     // Returns the current buffer pool utilization, in the range 0.0 (no buffers
     // are in use by producers or consumers) to 1.0 (all buffers are in use).
     virtual double GetBufferPoolUtilization() const = 0;
+
+    virtual void SetCameraFacing(bool is_back_camera) {}
   };
 
   virtual ~VideoCaptureDevice();