Output DeviceName from various windows ScreenCapturer related implementations

webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc

Index: webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc
diff --git a/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc b/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc
index 4870c754d24f2b46cc3e53d6cac26557de12f7fc..c2a0794fe34fffb67d033d91949722ce0c750bdb 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc
+++ b/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc
@@ -146,6 +146,11 @@ DesktopRect DxgiAdapterDuplicator::ScreenRect(int id) const {
   return duplicators_[id].desktop_rect();
 }
 
+const std::string& DxgiAdapterDuplicator::GetDeviceName(int id) const {
+  RTC_DCHECK(id >= 0 && id < static_cast<int>(duplicators_.size()));
+  return duplicators_[id].device_name();
+}
+
 int DxgiAdapterDuplicator::screen_count() const {
   return static_cast<int>(duplicators_.size());
 }