Output DeviceName from various windows ScreenCapturer related implementations

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 41 matching lines @@
                         int monitor_id,
                         SharedDesktopFrame* target);
 
   // Returns desktop rect covered by this DxgiAdapterDuplicator.
   DesktopRect desktop_rect() const { return desktop_rect_; }
 
   // Returns the size of one screen owned by this DxgiAdapterDuplicator. |id|
   // should be between [0, screen_count()).
   DesktopRect ScreenRect(int id) const;
 
+  // Returns the device name of one screen owned by this DxgiAdapterDuplicator
+  // in utf8 encoding. |id| should be between [0, screen_count()).
+  const std::string& GetDeviceName(int id) const;
+
   // Returns the count of screens owned by this DxgiAdapterDuplicator. These
   // screens can be retrieved by an interger in the range of
   // [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_