Implement declarativeContent API.

chrome/browser/extensions/api/declarative/rules_registry_service.h

Index: chrome/browser/extensions/api/declarative/rules_registry_service.h
diff --git a/chrome/browser/extensions/api/declarative/rules_registry_service.h b/chrome/browser/extensions/api/declarative/rules_registry_service.h
index db0485b2f8262bfc1c7c1b2753ec48811dfba90b..1910d1650b41ccc90603ce133636c4c5f6cfcdb8 100644
--- a/chrome/browser/extensions/api/declarative/rules_registry_service.h
+++ b/chrome/browser/extensions/api/declarative/rules_registry_service.h
@@ -21,6 +21,7 @@ class NotificationSource;
 }
 
 namespace extensions {
+class ContentRulesRegistry;
 class RulesRegistry;
 class RulesRegistryStorageDelegate;
 }
@@ -50,6 +51,11 @@ class RulesRegistryService : public content::NotificationObserver  {
   scoped_refptr<RulesRegistry> GetRulesRegistry(
       const std::string& event_name) const;
 
+  // Accessors for each type of rules registry.
+  ContentRulesRegistry* content_rules_registry() const {
+    return content_rules_registry_;
+  }
+
   // For testing.
   void SimulateExtensionUnloaded(const std::string& extension_id);
  private:
@@ -72,6 +78,10 @@ class RulesRegistryService : public content::NotificationObserver  {
   // keep track of them so we can tell them to do cleanup on shutdown.
   std::vector<RulesRegistryStorageDelegate*> delegates_;
 
+  // Weak pointer into rule_registries_ to make it easier to handle content rule
+  // conditions.
+  ContentRulesRegistry* content_rules_registry_;
+
   content::NotificationRegistrar registrar_;
 
   Profile* profile_;