Skips the first frame in DxgiDuplicatorController

webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.h

Index: webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.h
diff --git a/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.h b/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.h
index 0261105ea09c46ac8d9d2dd823000c1dd4da45fe..10a549c3109675312693f401868b66a52a575c94 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.h
+++ b/webrtc/modules/desktop_capture/win/dxgi_adapter_duplicator.h
@@ -70,17 +70,18 @@ class DxgiAdapterDuplicator {
   // Returns the count of screens owned by this DxgiAdapterDuplicator. These
   // screens can be retrieved by an interger in the range of
   // [0, screen_count()).
-  int screen_count() const { return static_cast<int>(duplicators_.size()); }
-
- private:
-  friend class DxgiDuplicatorController;
-
-  bool DoInitialize();
+  int screen_count() const;
 
   void Setup(Context* context);
 
   void Unregister(const Context* const context);
 
+  // The minimum num_frames_captured() returned by |duplicators_|.
+  int64_t num_frames_captured() const;
+
+ private:
+  bool DoInitialize();
+
   const D3dDevice device_;
   std::vector<DxgiOutputDuplicator> duplicators_;
   DesktopRect desktop_rect_;