Add CloudExternalDataPolicyObserverChromeOS

chrome/browser/policy/cloud/mock_cloud_external_data_manager.cc

Index: chrome/browser/policy/cloud/mock_cloud_external_data_manager.cc
diff --git a/chrome/browser/policy/cloud/mock_cloud_external_data_manager.cc b/chrome/browser/policy/cloud/mock_cloud_external_data_manager.cc
index 7cea83f52194a165bd0703e6b735e99c86c7f47e..d1b0c16929ae466e7d8337d67eb1740f0bebed45 100644
--- a/chrome/browser/policy/cloud/mock_cloud_external_data_manager.cc
+++ b/chrome/browser/policy/cloud/mock_cloud_external_data_manager.cc
@@ -5,6 +5,8 @@
 #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 {
@@ -15,4 +17,11 @@ 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