[WebRTC] A real ScreenCapturer test

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.
  */
 
@@ skipping 61 matching lines @@
       // This usually means we do not have enough memory or SharedMemoryFactory
       // cannot work correctly.
       callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);
       return;
     }
     frames_.ReplaceCurrentFrame(SharedDesktopFrame::Wrap(std::move(new_frame)));
   }
 
   if (current_screen_id == kFullDesktopScreenId) {
     if (!DxgiDuplicatorController::Instance()->Duplicate(
-            &context_, frames_.previous_frame(), frames_.current_frame())) {
+            &context_, frames_.current_frame())) {
       // Screen size may be changed, so we need to reset the frames.
       frames_.Reset();
       callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
       return;
     }
   } else {
     if (!DxgiDuplicatorController::Instance()->DuplicateMonitor(
-            &context_, current_screen_id, frames_.previous_frame(),
-            frames_.current_frame())) {
+            &context_, current_screen_id, frames_.current_frame())) {
       // Screen size may be changed, so we need to reset the frames.
       frames_.Reset();
       if (current_screen_id >=
           DxgiDuplicatorController::Instance()->ScreenCount()) {
         // Current monitor has been removed from the system.
         callback_->OnCaptureResult(Result::ERROR_PERMANENT, nullptr);
       } else {
         callback_->OnCaptureResult(Result::ERROR_TEMPORARY, nullptr);
       }
       return;
@@ skipping 29 matching lines @@
 
   int screen_count = DxgiDuplicatorController::Instance()->ScreenCount();
   if (id >= 0 && id < screen_count) {
     current_screen_id = id;
     return true;
   }
   return false;
 }
 
 }  // namespace webrtc