Allow Windows to return a monitor out of the first quadrant

webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 53 matching lines @@
   // [0, screen_count()).
   int screen_count() const;
 
   void Setup(Context* context);
 
   void Unregister(const Context* const context);
 
   // The minimum num_frames_captured() returned by |duplicators_|.
   int64_t GetNumFramesCaptured() const;
 
+  // Moves |desktop_rect_| and all underlying |duplicators_|. See
+  // DxgiDuplicatorController::TranslateRect().
+  void TranslateRect(const DesktopVector& position);
+
  private:
   bool DoInitialize();
 
   const D3dDevice device_;
   std::vector<DxgiOutputDuplicator> duplicators_;
   DesktopRect desktop_rect_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_WIN_DXGI_ADAPTER_DUPLICATOR_H_