Revert 170319 - Removed dead code from chrome/browser/extensions/api/declarative

chrome/browser/extensions/api/declarative/rules_registry_with_cache.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_API_DECLARATIVE_RULES_REGISTRY_WITH_CACHE_H__
 #define CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_RULES_REGISTRY_WITH_CACHE_H__
 
 #include "chrome/browser/extensions/api/declarative/rules_registry.h"
 
 #include <map>
@@ skipping 18 matching lines @@
     virtual bool IsReady() = 0;
 
     // Called to notify the Delegate that the rules for the given extension
     // have changed.
     virtual void OnRulesChanged(RulesRegistryWithCache* rules_registry,
                                 const std::string& extension_id) = 0;
   };
 
   explicit RulesRegistryWithCache(Delegate* delegate);
 
+  // Returns true if we are ready to process rules.
+  bool IsReady() {
+    return !delegate_.get() || delegate_->IsReady();
+  }
+
+  // Add a callback to call when we transition to Ready.
+  void AddReadyCallback(const base::Closure& callback);
+
   // Called by our delegate when we are ready. This is called exactly once,
   // if we have a delegate.
   void OnReady();
 
   // RulesRegistry implementation:
   virtual std::string AddRules(
       const std::string& extension_id,
       const std::vector<linked_ptr<RulesRegistry::Rule> >& rules) OVERRIDE;
   virtual std::string RemoveRules(
       const std::string& extension_id,
@@ skipping 36 matching lines @@
 
   RulesDictionary rules_;
 
   scoped_ptr<Delegate> delegate_;
   std::vector<base::Closure> ready_callbacks_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DECLARATIVE_RULES_REGISTRY_WITH_CACHE_H__