Allow registering of custom wxWebView backends.

Add wxWebViewFactory as an abstract factory to provide backend creation. Remove old factory methods using wxWebViewBackend enum in favour of the new wxString based method.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73369 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/webview_webkit.h

@@ -164,6 +164,21 @@ private:
     wxDECLARE_DYNAMIC_CLASS(wxWebViewWebKit);
 };
 
+class WXDLLIMPEXP_WEBVIEW wxWebViewFactoryWebKit : public wxWebViewFactory
+{
+public:
+    virtual wxWebView* Create() { return new wxWebViewWebKit; }
+    virtual wxWebView* Create(wxWindow* parent,
+                              wxWindowID id,
+                              const wxString& url = wxWebViewDefaultURLStr,
+                              const wxPoint& pos = wxDefaultPosition,
+                              const wxSize& size = wxDefaultSize,
+                              long style = 0,
+                              const wxString& name = wxWebViewNameStr)
+    { return new wxWebViewWebKit(parent, id, url, pos, size, style, name); }
+};
+
+
 #endif // wxUSE_WEBVIEW && wxUSE_WEBVIEW_WEBKIT && defined(__WXGTK__)
 
 #endif