Wrap ScreenCapturer with ScreenCapturerDifferWrapper

webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc

 /*
  *  Copyright (c) 2016 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 "webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h"
 
 #include <utility>
 
 #include "webrtc/base/checks.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/timeutils.h"
 #include "webrtc/modules/desktop_capture/desktop_frame.h"
 
 namespace webrtc {
 
 using Microsoft::WRL::ComPtr;
 
+// static
 bool ScreenCapturerWinDirectx::IsSupported() {
   // Forward IsSupported function call to DxgiDuplicatorController.
   return DxgiDuplicatorController::Instance()->IsSupported();
 }
 
 ScreenCapturerWinDirectx::ScreenCapturerWinDirectx(
     const DesktopCaptureOptions& options)
     : callback_(nullptr) {}
 
 ScreenCapturerWinDirectx::~ScreenCapturerWinDirectx() {}
@@ skipping 96 matching lines @@
 
   int screen_count = DxgiDuplicatorController::Instance()->ScreenCount();
   if (id >= 0 && id < screen_count) {
     current_screen_id = id;
     return true;
   }
   return false;
 }
 
 }  // namespace webrtc