Add CreateWindowCapturer() and CreateScreenCapturer() in DesktopCapturer

webrtc/modules/desktop_capture/screen_capturer_win.cc

Index: webrtc/modules/desktop_capture/screen_capturer_win.cc
diff --git a/webrtc/modules/desktop_capture/screen_capturer_win.cc b/webrtc/modules/desktop_capture/screen_capturer_win.cc
index 1d05961affa9e2879894aa4b60e88522d407bc5b..00a512bdc7f72c1a46eed50df7d7f93eb0a05614 100644
--- a/webrtc/modules/desktop_capture/screen_capturer_win.cc
+++ b/webrtc/modules/desktop_capture/screen_capturer_win.cc
@@ -42,4 +42,22 @@ ScreenCapturer* ScreenCapturer::Create(const DesktopCaptureOptions& options) {
   return capturer.release();
 }
 
+// static
+std::unique_ptr<DesktopCapturer> DesktopCapturer::CreateRawScreenCapturer(
+    const DesktopCaptureOptions& options) {
+  std::unique_ptr<DesktopCapturer> capturer;
+  if (options.allow_directx_capturer() &&
+      ScreenCapturerWinDirectx::IsSupported()) {
+    capturer.reset(new ScreenCapturerWinDirectx(options));
+  } else {
+    capturer.reset(new ScreenCapturerWinGdi(options));
+  }
+
+  if (options.allow_use_magnification_api()) {
+    capturer.reset(new ScreenCapturerWinMagnifier(std::move(capturer)));
+  }
+
+  return capturer;
+}
+
 }  // namespace webrtc