Allow Windows to return a monitor out of the first quadrant

webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc

Index: webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc
diff --git a/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc b/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc
index caef1c2ca7b67c802b73040fd8f5337488187150..5947daf5dcccf8d8786e6d7c390721cbbc7468e8 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc
+++ b/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.cc
@@ -25,8 +25,7 @@ using Microsoft::WRL::ComPtr;
 namespace {
 
 bool IsValidRect(const RECT& rect) {
-  return rect.left >= 0 && rect.top >= 0 && rect.right > rect.left &&
-         rect.bottom > rect.top;
+  return rect.right > rect.left && rect.bottom > rect.top;
 }
 
 }  // namespace
@@ -153,4 +152,12 @@ int64_t DxgiAdapterDuplicator::GetNumFramesCaptured() const {
   return min;
 }
 
+void DxgiAdapterDuplicator::TranslateRect(const DesktopVector& position) {
+  desktop_rect_.Translate(position);
+  RTC_DCHECK(desktop_rect_.left() >= 0 && desktop_rect_.top() >= 0);
+  for (auto& duplicator : duplicators_) {
+    duplicator.TranslateRect(position);
+  }
+}
+
 }  // namespace webrtc