Allow Windows to return a monitor out of the first quadrant

webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h

Index: webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
diff --git a/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h b/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
index 7d2c2edef605c72d91b7dcd76a024718d805208e..dfc19af61c3a004fd8cdc541c67dd894cc3a10e3 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
+++ b/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
@@ -75,6 +75,9 @@ class DxgiOutputDuplicator {
   // How many frames have been captured by this DxigOutputDuplicator.
   int64_t num_frames_captured() const;
 
+  // Moves |desktop_rect_|. See DxgiDuplicatorController::TranslateRect().
+  void TranslateRect(const DesktopVector& position);
+
  private:
   // Calls DoDetectUpdatedRegion(). If it fails, this function sets the
   // |updated_region| as entire UntranslatedDesktopRect().
@@ -109,7 +112,7 @@ class DxgiOutputDuplicator {
 
   const D3dDevice device_;
   const Microsoft::WRL::ComPtr<IDXGIOutput1> output_;
-  const DesktopRect desktop_rect_;
+  DesktopRect desktop_rect_;
   Microsoft::WRL::ComPtr<IDXGIOutputDuplication> duplication_;
   DXGI_OUTDUPL_DESC desc_;
   std::vector<uint8_t> metadata_;