Enable fetching of admin policies for login screen apps

components/policy/core/common/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 COMPONENTS_POLICY_CORE_COMMON_SCHEMA_REGISTRY_H_
 #define COMPONENTS_POLICY_CORE_COMMON_SCHEMA_REGISTRY_H_
 
 #include <set>
 
 #include "base/compiler_specific.h"
@@ skipping 114 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(CombinedSchemaRegistry);
 };
 
 // A registry that wraps another schema registry.
 class POLICY_EXPORT ForwardingSchemaRegistry
     : public SchemaRegistry,
       public SchemaRegistry::Observer,
       public SchemaRegistry::InternalObserver {
  public:
+  // If |forward_readiness| is true, then this registry will become ready as
+  // soon as the wrapped registry gets ready.
+  //
   // This registry will stop updating its SchemaMap when |wrapped| is
   // destroyed.
-  explicit ForwardingSchemaRegistry(SchemaRegistry* wrapped);
+  ForwardingSchemaRegistry(SchemaRegistry* wrapped, bool forward_readiness);
   ~ForwardingSchemaRegistry() override;
 
   // SchemaRegistry:
   void RegisterComponents(PolicyDomain domain,
                           const ComponentMap& components) override;
   void UnregisterComponent(const PolicyNamespace& ns) override;
 
   // SchemaRegistry::Observer:
   void OnSchemaRegistryUpdated(bool has_new_schemas) override;
+  void OnSchemaRegistryReady() override;
 
   // SchemaRegistry::InternalObserver:
   void OnSchemaRegistryShuttingDown(SchemaRegistry* registry) override;
 
  private:
+  void UpdateReadiness();
+
   SchemaRegistry* wrapped_;
+  bool forward_readiness_;
 
   DISALLOW_COPY_AND_ASSIGN(ForwardingSchemaRegistry);
 };
 
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_SCHEMA_REGISTRY_H_