Output DeviceName from various windows ScreenCapturer related implementations

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 0aa7eddcaa652a08f5c476c03f7651042d7a608a..47e078f4ad27f3925bb69e868aad13578c732c4c 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
+++ b/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
@@ -17,6 +17,7 @@
 #include <DXGI1_2.h>
 
 #include <memory>
+#include <string>
 #include <vector>
 
 #include "webrtc/modules/desktop_capture/desktop_frame_rotation.h"
@@ -68,6 +69,9 @@ class DxgiOutputDuplicator {
   // Returns the desktop rect covered by this DxgiOutputDuplicator.
   DesktopRect desktop_rect() const { return desktop_rect_; }
 
+  // Returns the device name from DXGI_OUTPUT_DESC in utf8 encoding.
+  const std::string& device_name() const { return device_name_; }
+
   void Setup(Context* context);
 
   void Unregister(const Context* const context);
@@ -112,6 +116,7 @@ class DxgiOutputDuplicator {
 
   const D3dDevice device_;
   const Microsoft::WRL::ComPtr<IDXGIOutput1> output_;
+  const std::string device_name_;
   DesktopRect desktop_rect_;
   Microsoft::WRL::ComPtr<IDXGIOutputDuplication> duplication_;
   DXGI_OUTDUPL_DESC desc_;