First pass as implementing the greasemonkey API. This patch

webkit/glue/webframe.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_GLUE_WEBFRAME_H_
 #define WEBKIT_GLUE_WEBFRAME_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 77 matching lines @@
   // something to the user (e.g., a local error page or the alternate error
   // page).
   virtual void LoadAlternateHTMLErrorPage(const WebRequest* request,
                                           const WebError& error,
                                           const GURL& error_page_url,
                                           bool replace,
                                           const GURL& fake_url) = 0;
 
   // Executes a string of JavaScript in the web frame. The script_url param is
   // the URL where the script in question can be found, if any. The renderer may
-  // request this URL to show the developer the source of the error.
+  // request this URL to show the developer the source of the error.  The
+  // start_line parameter is the base line number to use for error reporting.
   virtual void ExecuteJavaScript(const std::string& js_code,
-                                 const GURL& script_url) = 0;
+                                 const GURL& script_url,
+                                 int start_line) = 0;
 
   // Returns a string representing the state of the previous page load for
   // later use when loading. The previous page is the page that was loaded
   // before DidCommitLoadForFrame was received.
   //
   // Returns false if there is no valid state to return (for example, there is
   // no previous item). Returns true if the previous item's state was retrieved,
   // even if that state may be empty.
   virtual bool GetPreviousHistoryState(std::string* history_state) const = 0;
 
@@ skipping 261 matching lines @@
   virtual bool IsReloadAllowingStaleData() const = 0;
 
   // Only for test_shell
   virtual int PendingFrameUnloadEventCount() const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(WebFrame);
 };
 
 #endif  // WEBKIT_GLUE_WEBFRAME_H_