Block content scripts from executing until user grants permission

chrome/browser/extensions/user_script_master.h

 // Copyright (c) 2012 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_MASTER_H_
 #define CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_MASTER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 131 matching lines @@
                        const content::NotificationDetails& details) OVERRIDE;
 
   // ExtensionRegistryObserver implementation.
   virtual void OnExtensionLoaded(content::BrowserContext* browser_context,
                                  const Extension* extension) OVERRIDE;
   virtual void OnExtensionUnloaded(
       content::BrowserContext* browser_context,
       const Extension* extension,
       UnloadedExtensionInfo::Reason reason) OVERRIDE;
 
-  // Sends the renderer process a new set of user scripts.
+  // Sends the renderer process a new set of user scripts. If
+  // |changed_extensions| is not empty, this signals that only the scripts from
+  // those extensions should be updated. Otherwise, all extensions will be
+  // updated.
   void SendUpdate(content::RenderProcessHost* process,
-                  base::SharedMemory* shared_memory);
+                  base::SharedMemory* shared_memory,
+                  const std::set<std::string>& changed_extensions);
 
   // Manages our notification registrations.
   content::NotificationRegistrar registrar_;
 
   // We hang on to our pointer to know if we've already got one running.
   scoped_refptr<ScriptReloader> script_reloader_;
 
   // Contains the scripts that were found the last time scripts were updated.
   scoped_ptr<base::SharedMemory> shared_memory_;
 
   // List of scripts from currently-installed extensions we should load.
   UserScriptList user_scripts_;
 
   // Maps extension info needed for localization to an extension ID.
   ExtensionsInfo extensions_info_;
 
+  // The IDs of the extensions which have changed since the last update sent to
+  // the renderer.
+  std::set<std::string> changed_extensions_;
+
   // If the extensions service has finished loading its initial set of
   // extensions.
   bool extensions_service_ready_;
 
   // If list of user scripts is modified while we're loading it, we note
   // that we're currently mid-load and then start over again once the load
   // finishes.  This boolean tracks whether another load is pending.
   bool pending_load_;
 
   // The profile for which the scripts managed here are installed.
   Profile* profile_;
 
   // Listen to extension load, unloaded notifications.
   ScopedObserver<ExtensionRegistry, ExtensionRegistryObserver>
       extension_registry_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(UserScriptMaster);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_USER_SCRIPT_MASTER_H_