Add CloudExternalDataPolicyObserverChromeOS

chrome/browser/policy/cloud/mock_cloud_external_data_manager.cc

 // 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.
 
 #include "chrome/browser/policy/cloud/mock_cloud_external_data_manager.h"
 
 #include "base/callback.h"
+#include "base/memory/weak_ptr.h"
+#include "components/policy/core/common/external_data_fetcher.h"
 #include "net/url_request/url_request_context_getter.h"
 
 namespace policy {
 
 MockCloudExternalDataManager::MockCloudExternalDataManager() {
 }
 
 MockCloudExternalDataManager::~MockCloudExternalDataManager() {
 }
 
+scoped_ptr<ExternalDataFetcher>
+    MockCloudExternalDataManager::CreateExternalDataFetcher(
+        const std::string& policy) {
+  return make_scoped_ptr(new ExternalDataFetcher(weak_factory_.GetWeakPtr(),
+                                                 policy));
+}
+
 }  // namespace policy