Add CreateWindowCapturer() and CreateScreenCapturer() in DesktopCapturer

webrtc/modules/desktop_capture/window_capturer_mac.mm

Index: webrtc/modules/desktop_capture/window_capturer_mac.mm
diff --git a/webrtc/modules/desktop_capture/window_capturer_mac.mm b/webrtc/modules/desktop_capture/window_capturer_mac.mm
index 2272b3f51e1362aadd5f7e6edfb8eeb55134d9a2..72b20f3411b80af0fd9d3bc790d12df2aa6a012a 100644
--- a/webrtc/modules/desktop_capture/window_capturer_mac.mm
+++ b/webrtc/modules/desktop_capture/window_capturer_mac.mm
@@ -241,4 +241,11 @@ WindowCapturer* WindowCapturer::Create(const DesktopCaptureOptions& options) {
   return new WindowCapturerMac(options.full_screen_chrome_window_detector());
 }
 
+// static
+std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawWindowCapturer(
+    const DesktopCaptureOptions& options) {
+  return std::unique_ptr<DesktopCapturer>(
+      new WindowCapturerMac(options.full_screen_chrome_window_detector()));
+}
+
 }  // namespace webrtc