Implement fetching, caching and retrieval of external policy data

chrome/browser/policy/cloud/cloud_policy_store.cc

 // 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.
 
 #include "chrome/browser/policy/cloud/cloud_policy_store.h"
 
+#include "base/logging.h"
+#include "chrome/browser/policy/cloud/cloud_external_data_manager.h"
+
 namespace policy {
 
 CloudPolicyStore::Observer::~Observer() {}
 
 CloudPolicyStore::CloudPolicyStore()
     : status_(STATUS_OK),
       validation_status_(CloudPolicyValidatorBase::VALIDATION_OK),
       is_initialized_(false) {}
 
 CloudPolicyStore::~CloudPolicyStore() {}
 
 void CloudPolicyStore::AddObserver(CloudPolicyStore::Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void CloudPolicyStore::RemoveObserver(CloudPolicyStore::Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void CloudPolicyStore::NotifyStoreLoaded() {
   is_initialized_ = true;
+  // The |external_data_manager_| must be notified first so that when other
+  // observers are informed about the changed policies and try to fetch external
+  // data referenced by these, the |external_data_manager_| has the required
+  // metadata already.
+  if (external_data_manager_)
+    external_data_manager_->OnPolicyStoreLoaded();
   FOR_EACH_OBSERVER(Observer, observers_, OnStoreLoaded(this));
 }
 
 void CloudPolicyStore::NotifyStoreError() {
   is_initialized_ = true;
   FOR_EACH_OBSERVER(Observer, observers_, OnStoreError(this));
 }
 
-}  // namespace
+void CloudPolicyStore::SetExternalDataManager(
+    base::WeakPtr<CloudExternalDataManager> external_data_manager) {
+  DCHECK(!external_data_manager_);
+  external_data_manager_ = external_data_manager;
+  if (is_initialized_)
+    external_data_manager_->OnPolicyStoreLoaded();
+}
+
+}  // namespace policy