Wrap ScreenCapturer with ScreenCapturerDifferWrapper

webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h

Index: webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
diff --git a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
index 119ffaecdfb0abac84436cca9caa33837129fa47..86232c74ff426abf3a9c5c15b88a1d53095022f8 100644
--- a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
+++ b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
@@ -28,10 +28,11 @@ namespace webrtc {
 // implementation won't work when ScreenCaptureFrameQueue.kQueueLength is not 2.
 class ScreenCapturerWinDirectx : public ScreenCapturer {
  public:
-  // Whether the system support DirectX based capturing.
+  // Whether the system supports DirectX based capturing.
   static bool IsSupported();
 
   explicit ScreenCapturerWinDirectx(const DesktopCaptureOptions& options);
+
   virtual ~ScreenCapturerWinDirectx();
 
   void Start(Callback* callback) override;