Make all content scripts from an extension run in the same

chrome/renderer/user_script_slave.h

 // Copyright (c) 2009 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 CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_SLAVE_H_
 #define CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_SLAVE_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 17 matching lines @@
   UserScriptSlave();
 
   // Update the parsed scripts from shared memory.
   bool UpdateScripts(base::SharedMemoryHandle shared_memory);
 
   // Inject the appropriate scripts into a frame based on its URL.
   // TODO(aa): Extract a UserScriptFrame interface out of this to improve
   // testability.
   bool InjectScripts(WebKit::WebFrame* frame, UserScript::RunLocation location);
 
+  static int GetIsolatedWorldId(const std::string& extension_id);
+
   static void InsertInitExtensionCode(std::vector<WebScriptSource>* sources,
                                       const std::string& extension_id);
  private:
   // Shared memory containing raw script data.
   scoped_ptr<base::SharedMemory> shared_memory_;
 
   // Parsed script data.
   std::vector<UserScript*> scripts_;
   STLElementDeleter<std::vector<UserScript*> > script_deleter_;
 
   // Greasemonkey API source that is injected with the scripts.
   base::StringPiece api_js_;
 
   // The line number of the first line of the user script among all of the
   // injected javascript.  This is used to make reported errors correspond with
   // the proper line in the user script.
   int user_script_start_line_;
 
   DISALLOW_COPY_AND_ASSIGN(UserScriptSlave);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_SLAVE_H_