Skips the first frame in DxgiDuplicatorController

webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.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 126 matching lines @@
              context->contexts.size() == duplicators_.size());
   return duplicators_[monitor_id].Duplicate(&context->contexts[monitor_id],
                                             DesktopVector(), target);
 }
 
 DesktopRect DxgiAdapterDuplicator::ScreenRect(int id) const {
   RTC_DCHECK(id >= 0 && id < static_cast<int>(duplicators_.size()));
   return duplicators_[id].desktop_rect();
 }
 
+int DxgiAdapterDuplicator::screen_count() const {
+  return static_cast<int>(duplicators_.size());
+}
+
+int64_t DxgiAdapterDuplicator::GetNumFramesCaptured() const {
+  int64_t min = INT64_MAX;
+  for (const auto& duplicator : duplicators_) {
+    min = std::min(min, duplicator.num_frames_captured());
+  }
+
+  return min;
+}
+
 }  // namespace webrtc