Output DeviceName from various windows ScreenCapturer related implementations

webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.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 96 matching lines @@
 }
 
 int DxgiDuplicatorController::ScreenCount() {
   rtc::CritScope lock(&lock_);
   if (Initialize()) {
     return ScreenCountUnlocked();
   }
   return 0;
 }
 
+bool DxgiDuplicatorController::GetDeviceNames(
+    std::vector<std::string>* output) {
+  rtc::CritScope lock(&lock_);
+  if (Initialize()) {
+    GetDeviceNamesUnlocked(output);
+    return true;
+  }
+  return false;
+}
+
 DxgiDuplicatorController::Result
 DxgiDuplicatorController::DoDuplicate(DxgiFrame* frame, int monitor_id) {
   RTC_DCHECK(frame);
   rtc::CritScope lock(&lock_);
 
   // The dxgi components and APIs do not update the screen resolution without
   // a reinitialization. So we use the GetDC() function to retrieve the screen
   // resolution to decide whether dxgi components need to be reinitialized.
   // If the screen resolution changed, it's very likely the next Duplicate()
   // function call will fail because of a missing monitor or the frame size is
@@ skipping 236 matching lines @@
 }
 
 int DxgiDuplicatorController::ScreenCountUnlocked() const {
   int result = 0;
   for (auto& duplicator : duplicators_) {
     result += duplicator.screen_count();
   }
   return result;
 }
 
+void DxgiDuplicatorController::GetDeviceNamesUnlocked(
+    std::vector<std::string>* output) const {
+  RTC_DCHECK(output);
+  for (auto& duplicator : duplicators_) {
+    for (int i = 0; i < duplicator.screen_count(); i++) {
+      output->push_back(duplicator.GetDeviceName(i));
+    }
+  }
+}
+
 DesktopSize DxgiDuplicatorController::SelectedDesktopSize(
     int monitor_id) const {
   if (monitor_id < 0) {
     return desktop_size();
   }
 
   return ScreenRect(monitor_id).size();
 }
 
 bool DxgiDuplicatorController::EnsureFrameCaptured(Context* context,
@@ skipping 50 matching lines @@
 void DxgiDuplicatorController::TranslateRect() {
   const DesktopVector position =
       DesktopVector().subtract(desktop_rect_.top_left());
   desktop_rect_.Translate(position);
   for (auto& duplicator : duplicators_) {
     duplicator.TranslateRect(position);
   }
 }
 
 }  // namespace webrtc