Introduced a ForwardingPolicyProvider.

chrome/browser/policy/schema_registry.h

 // Copyright 2013 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_POLICY_SCHEMA_REGISTRY_H_
 #define CHROME_BROWSER_POLICY_SCHEMA_REGISTRY_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 17 matching lines @@
  public:
   class Observer {
    public:
     // Invoked whenever schemas are registered or unregistered.
     // |has_new_schemas| is true if a new component has been registered since
     // the last update; this allows observers to ignore updates when
     // components are unregistered but still get a handle to the current map
     // (e.g. for periodic reloads).
     virtual void OnSchemaRegistryUpdated(bool has_new_schemas) = 0;
 
+    // Invoked when all policy domains become ready.
+    virtual void OnSchemaRegistryReady() = 0;
+
    protected:
     virtual ~Observer();
   };
 
   SchemaRegistry();
   virtual ~SchemaRegistry();
 
   const scoped_refptr<SchemaMap>& schema_map() const { return schema_map_; }
 
   // Register a single component.
   void RegisterComponent(const PolicyNamespace& ns,
                          const Schema& schema);
 
   // Register a list of components for a given domain.
   virtual void RegisterComponents(PolicyDomain domain,
                                   const ComponentMap& components);
 
   virtual void UnregisterComponent(const PolicyNamespace& ns);
 
+  // Returns true if all domains have registered the initial components.
+  bool IsReady() const;
+
+  // This indicates that the initial components for |domain| have all been
+  // registered. It must be invoked at least once for each policy domain;
+  // subsequent calls for the same domain are ignored.
+  void SetReady(PolicyDomain domain);
+
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   bool HasObservers() const;
 
  protected:
   void Notify(bool has_new_schemas);
 
   scoped_refptr<SchemaMap> schema_map_;
 
  private:
   ObserverList<Observer, true> observers_;
+  bool domains_ready_[POLICY_DOMAIN_SIZE];
 
   DISALLOW_COPY_AND_ASSIGN(SchemaRegistry);
 };
 
 // A registry that combines the maps of other registries.
 class CombinedSchemaRegistry : public SchemaRegistry,
                                public SchemaRegistry::Observer {
  public:
   CombinedSchemaRegistry();
   virtual ~CombinedSchemaRegistry();
 
   void Track(SchemaRegistry* registry);
   void Untrack(SchemaRegistry* registry);
 
   virtual void RegisterComponents(PolicyDomain domain,
                                   const ComponentMap& components) OVERRIDE;
 
   virtual void UnregisterComponent(const PolicyNamespace& ns) OVERRIDE;
 
   virtual void OnSchemaRegistryUpdated(bool has_new_schemas) OVERRIDE;
 
+  virtual void OnSchemaRegistryReady() OVERRIDE;
+
  private:
   void Combine(bool has_new_schemas);
 
   std::set<SchemaRegistry*> registries_;
   scoped_refptr<SchemaMap> own_schema_map_;
 
   DISALLOW_COPY_AND_ASSIGN(CombinedSchemaRegistry);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_SCHEMA_REGISTRY_H_