adding NSImage support to wxIcon on OSX, as IconRefs are on their way out, and performance under 10.9 is suffering

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75994 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/icon.h

@@ -52,7 +52,11 @@ public:
     wxSize GetSize() const { return wxSize(GetWidth(), GetHeight()); }
 
     WXHICON GetHICON() const;
-
+    
+#if wxOSX_USE_COCOA
+    WX_NSImage GetNSImage() const ;
+#endif
+    
 protected:
     virtual wxGDIRefData *CreateGDIRefData() const;
     virtual wxGDIRefData *CloneGDIRefData(const wxGDIRefData *data) const;