Remove the requirement of D3D_FEATURE_LEVEL_11_0, but export the D3D_FEATURE_LEVEL through APIs

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 770cfa212c586da6d9009bb3f312bf6008d9a9c5..bff89b84ffe7c89893ce8464e9bcb6e3c306dc62 100644
--- a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc
+++ b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc
@@ -23,10 +23,20 @@ using Microsoft::WRL::ComPtr;
 
 // static
 bool ScreenCapturerWinDirectx::IsSupported() {
-  // Forward IsSupported function call to DxgiDuplicatorController.
+  // Forwards IsSupported() function call to DxgiDuplicatorController.
   return DxgiDuplicatorController::Instance()->IsSupported();
 }
 
+// static
+bool ScreenCapturerWinDirectx::SupportedFeatureLevels(
+    D3D_FEATURE_LEVEL* min_feature_level,
+    D3D_FEATURE_LEVEL* max_feature_level) {
+  // Forwards SupportedFeatureLevels() function call to
+  // DxgiDuplicatorController.
+  return DxgiDuplicatorController::Instance()->SupportedFeatureLevels(
+      min_feature_level, max_feature_level);
+}
+
 ScreenCapturerWinDirectx::ScreenCapturerWinDirectx(
     const DesktopCaptureOptions& options)
     : callback_(nullptr) {}