Add DesktopCapturer GetSourceList SelectSource FocusOnSelectedSource functions

webrtc/modules/desktop_capture/window_capturer_win.cc

Index: webrtc/modules/desktop_capture/window_capturer_win.cc
diff --git a/webrtc/modules/desktop_capture/window_capturer_win.cc b/webrtc/modules/desktop_capture/window_capturer_win.cc
index 9253b86d2297f6d4922df5c01eece148962accb9..c43db7e6bb46894edccbe5d9430eeb2d8a01d3de 100644
--- a/webrtc/modules/desktop_capture/window_capturer_win.cc
+++ b/webrtc/modules/desktop_capture/window_capturer_win.cc
@@ -63,7 +63,7 @@ BOOL CALLBACK WindowsEnumerationHandler(HWND hwnd, LPARAM param) {
   }
 
   WindowCapturer::Window window;
-  window.id = reinterpret_cast<WindowCapturer::WindowId>(hwnd);
+  window.id = reinterpret_cast<WindowId>(hwnd);
 
   const size_t kTitleLength = 500;
   WCHAR window_title[kTitleLength];