Fix some broken or add some missing interface declarations for Phoenix

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68973 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/dcgraph.h

@@ -35,6 +35,11 @@ public:
     */
     wxGCDC( const wxPrinterDC& dc );
 
+    /**
+       Construct a wxGCDC from an existing grtaphics context.
+    */
+    wxGCDC(wxGraphicsContext* context);
+
     /**
        Constructs a wxGCDC from a wxEnhMetaFileDC.
 
@@ -46,9 +51,17 @@ public:
     */
     wxGCDC( const wxEnhMetaFileDC& dc );
 
+    wxGCDC();
+    virtual ~wxGCDC();
     /**
        Retrieves associated wxGraphicsContext
     */
     wxGraphicsContext* GetGraphicsContext() const;
+
+    /**
+       Set the grpahics context to be used for this wxGCDC.
+    */
+    void SetGraphicsContext( wxGraphicsContext* ctx );
+
 };