Implement wxWindowDC::Clear()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21802 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cocoa/dcclient.h

@@ -26,6 +26,9 @@ public:
     // Create a DC corresponding to a window
     wxWindowDC(wxWindow *win);
     ~wxWindowDC(void);
+
+    // NSView specific functions
+    virtual void Clear();
 protected:
     wxWindow *m_window;
 };