[DesktopCapture] Detect screen resolution changes in DirectX capturer

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 188fddd006934891cf5d732503bbb752ed608601..a48bda9954bd7e316474aa3701de33a03bf033f6 100644
--- a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
+++ b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
@@ -19,6 +19,7 @@
 #include "webrtc/modules/desktop_capture/desktop_capturer.h"
 #include "webrtc/modules/desktop_capture/desktop_capture_options.h"
 #include "webrtc/modules/desktop_capture/desktop_region.h"
+#include "webrtc/modules/desktop_capture/resolution_change_detector.h"
 #include "webrtc/modules/desktop_capture/screen_capture_frame_queue.h"
 #include "webrtc/modules/desktop_capture/shared_desktop_frame.h"
 #include "webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.h"
@@ -61,10 +62,9 @@ class ScreenCapturerWinDirectx : public DesktopCapturer {
   ScreenCaptureFrameQueue<SharedDesktopFrame> frames_;
   std::unique_ptr<SharedMemoryFactory> shared_memory_factory_;
   Callback* callback_ = nullptr;
-
   DxgiDuplicatorController::Context context_;
-
   SourceId current_screen_id_ = kFullDesktopScreenId;
+  ResolutionChangeDetector resolution_change_detector_;
 
   RTC_DISALLOW_COPY_AND_ASSIGN(ScreenCapturerWinDirectx);
 };