Use FallbackDesktopCapturerWrapper in ScreenCapturerWinMagnifier

webrtc/modules/desktop_capture/screen_capturer_win.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include <memory>
 #include <utility>
 
 #include "webrtc/modules/desktop_capture/desktop_capturer.h"
 #include "webrtc/modules/desktop_capture/desktop_capture_options.h"
+#include "webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper.h"
 #include "webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h"
 #include "webrtc/modules/desktop_capture/win/screen_capturer_win_gdi.h"
 #include "webrtc/modules/desktop_capture/win/screen_capturer_win_magnifier.h"
 
 namespace webrtc {
 
 // 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)));
+    capturer.reset(new FallbackDesktopCapturerWrapper(

[Sergey Ulanov, 2017/02/21 20:49:31]

Please add a comment to explain why we need to use the fallback capturer here

[Hzj_jie, 2017/02/21 23:27:33]

Done.

+        std::unique_ptr<DesktopCapturer>(new ScreenCapturerWinMagnifier()),
+        std::move(capturer)));
   }
 
   return capturer;
 }
 
 }  // namespace webrtc