[WebRTC] A real ScreenCapturer test

webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc

Index: webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc
diff --git a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc
index a09935fb01aad3a8aa67def08e5850c4656a392f..e4b2c3e8a225b397d4c67693baa646c2c98c34f3 100644
--- a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc
+++ b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc
@@ -79,7 +79,7 @@ void ScreenCapturerWinDirectx::Capture(const DesktopRegion& region) {
 
   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);
@@ -87,8 +87,7 @@ void ScreenCapturerWinDirectx::Capture(const DesktopRegion& region) {
     }
   } 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 >=