Add RunScript and implement on all backends. Document and add a very simple unit test.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/SOC2011_WEBVIEW@68275 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/webview_webkit.cpp

@@ -792,6 +792,12 @@ wxString wxWebViewWebKit::GetPageText()
                     wxConvUTF8);
 }
 
+void wxWebViewWebKit::RunScript(const wxString& javascript)
+{
+    webkit_web_view_execute_script(WEBKIT_WEB_VIEW(web_view), 
+                                   javascript.mb_str(wxConvUTF8));
+}
+
 // static
 wxVisualAttributes
 wxWebViewWebKit::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))