Skips the first frame in DxgiDuplicatorController

webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h

Index: webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
diff --git a/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h b/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
index 02a781487e932a104919f86b2d4228b2f02c9022..5a7053ab25e4e30223166c44cd78371e41a552c2 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
+++ b/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
@@ -72,9 +72,14 @@ class DxgiOutputDuplicator {
   // Returns the desktop rect covered by this DxgiOutputDuplicator.
   DesktopRect desktop_rect() const { return desktop_rect_; }
 
- private:
-  friend class DxgiAdapterDuplicator;
+  void Setup(Context* context);
+
+  void Unregister(const Context* const context);
+
+  // How many frames have been captured by this DxigOutputDuplicator.
+  int64_t num_frames_captured() const;
 
+ private:
   // Detects updated region translated by offset from IDXGIOutput1. This
   // function will set the |updated_region| as entire DesktopRect starts from
   // offset if it failed to execute Windows APIs.
@@ -97,10 +102,6 @@ class DxgiOutputDuplicator {
   // by offset.
   DesktopRect TranslatedDesktopRect(DesktopVector offset);
 
-  void Setup(Context* context);
-
-  void Unregister(const Context* const context);
-
   // Spreads changes from |context| to other registered Context(s) in
   // contexts_.
   void SpreadContextChange(const Context* const context);
@@ -126,6 +127,8 @@ class DxgiOutputDuplicator {
   // |last_frame_|.
   std::unique_ptr<SharedDesktopFrame> last_frame_;
   DesktopVector last_frame_offset_;
+
+  int64_t num_frames_captured_;
 };
 
 }  // namespace webrtc