First pass as implementing the greasemonkey API. This patch

webkit/glue/webframe_impl.cc

Index: webkit/glue/webframe_impl.cc
diff --git a/webkit/glue/webframe_impl.cc b/webkit/glue/webframe_impl.cc
index e8e009b9917fd2838aee616adbdb3721e6e7c2b3..a80a36c390ac248cf1324ff67b63dc50091f8f17 100644
--- a/webkit/glue/webframe_impl.cc
+++ b/webkit/glue/webframe_impl.cc
@@ -1552,11 +1552,12 @@ void WebFrameImpl::LoadAlternateHTMLErrorPage(const WebRequest* request,
 }
 
 void WebFrameImpl::ExecuteJavaScript(const std::string& js_code,
-                                     const GURL& script_url) {
+                                     const GURL& script_url,
+                                     int start_line) {
   WebCore::ScriptSourceCode source_code(
       webkit_glue::StdStringToString(js_code),
       webkit_glue::GURLToKURL(script_url),
-      1);  // base line number (for errors)
+      start_line);
   frame_->loader()->executeScript(source_code);
 }