Implement GetSelectedHTML for the ie and gtk webkit backends and document.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/SOC2011_WEBVIEW@68226 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/webview_webkit.h

@@ -145,6 +145,7 @@ public:
     virtual bool HasSelection();
     virtual void SelectAll();
     virtual wxString GetSelectedText();
+    virtual wxString GetSelectedHTML();
 
     /** FIXME: hack to work around signals being received too early */
     bool m_ready;

include/wx/msw/webview_ie.h

@@ -102,6 +102,7 @@ public:
     virtual bool HasSelection();
     virtual void DeleteSelection();
     virtual wxString GetSelectedText();
+    virtual wxString GetSelectedHTML();
 
 
     // ---- IE-specific methods

include/wx/osx/webview_webkit.h

@@ -107,6 +107,7 @@ public:
     virtual bool HasSelection() { return false };
     virtual void SelectAll() {};
     virtual wxString GetSelectedText();
+    virtual wxString GetSelectedHTML() { return ""; }
 
     // ---- methods not from the parent (common) interface
     wxString RunScript(const wxString& javascript);

include/wx/webview.h

@@ -288,6 +288,7 @@ public:
     virtual bool HasSelection() = 0;
     virtual void DeleteSelection() = 0;
     virtual wxString GetSelectedText() = 0;
+    virtual wxString GetSelectedHTML() = 0;
 
     // TODO:
     //     void EnableJavascript(bool enabled);             // maybe?