Create a mechanism define declarative rules via the extension manifest.

extensions/browser/api/declarative/rules_registry_service.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 EXTENSIONS_BROWSER_API_DECLARATIVE_RULES_REGISTRY_SERVICE_H__
 #define EXTENSIONS_BROWSER_API_DECLARATIVE_RULES_REGISTRY_SERVICE_H__
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 70 matching lines @@
   // Remove all rules registries of the given rules_registry_id.
   void RemoveRulesRegistriesByID(int rules_registry_id);
 
   // Accessors for each type of rules registry.
   ContentRulesRegistry* content_rules_registry() const {
     CHECK(content_rules_registry_);
     return content_rules_registry_;
   }
 
   // For testing.
-  void SimulateExtensionUninstalled(const std::string& extension_id);
+  void SimulateExtensionUninstalled(const Extension* extension);
 
  private:
   friend class BrowserContextKeyedAPIFactory<RulesRegistryService>;
 
   // Maps <event name, rules registry ID> to RuleRegistries that handle these
   // events.
   typedef std::map<RulesRegistryKey, scoped_refptr<RulesRegistry> >
       RulesRegistryMap;
 
   // ExtensionRegistryObserver implementation.
   void OnExtensionLoaded(content::BrowserContext* browser_context,
                          const Extension* extension) override;
   void OnExtensionUnloaded(content::BrowserContext* browser_context,
                            const Extension* extension,
                            UnloadedExtensionInfo::Reason reason) override;
   void OnExtensionUninstalled(content::BrowserContext* browser_context,
                               const Extension* extension,
                               extensions::UninstallReason reason) override;
 
   // Iterates over all registries, and calls |notification_callback| on them
-  // with |extension_id| as the argument. If a registry lives on a different
+  // with |extension| as the argument. If a registry lives on a different
   // thread, the call is posted to that thread, so no guarantee of synchronous
   // processing.
   void NotifyRegistriesHelper(
-      void (RulesRegistry::*notification_callback)(const std::string&),
-      const std::string& extension_id);
+      void (RulesRegistry::*notification_callback)(const Extension*),
+      const Extension* extension);
 
   // BrowserContextKeyedAPI implementation.
   static const char* service_name() {
     return "RulesRegistryService";
   }
   static const bool kServiceHasOwnInstanceInIncognito = true;
   static const bool kServiceIsNULLWhileTesting = true;
 
   int current_rules_registry_id_;
 
@@ skipping 11 matching lines @@
       extension_registry_observer_;
 
   content::BrowserContext* browser_context_;
 
   DISALLOW_COPY_AND_ASSIGN(RulesRegistryService);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_DECLARATIVE_RULES_REGISTRY_SERVICE_H__