Add ExtensionsApiClient interface, use it in the storage API SettingsFrontend

chrome/browser/extensions/api/chrome_extensions_api_client.cc

+// Copyright 2014 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/extensions/api/chrome_extensions_api_client.h"
+
+#if defined(ENABLE_CONFIGURATION_POLICY)
+#include "chrome/browser/extensions/api/storage/managed_value_store_cache.h"
+#endif
+
+namespace extensions {
+
+ChromeExtensionsAPIClient::ChromeExtensionsAPIClient() {}
+
+ChromeExtensionsAPIClient::~ChromeExtensionsAPIClient() {}
+
+void ChromeExtensionsAPIClient::AddAdditionalValueStoreCaches(
+    content::BrowserContext* context,
+    const scoped_refptr<SettingsStorageFactory>& factory,
+    const scoped_refptr<ObserverListThreadSafe<SettingsObserver> >& observers,
+    std::map<settings_namespace::Namespace, ValueStoreCache*>* caches) {
+#if defined(ENABLE_CONFIGURATION_POLICY)
+  // Add support for chrome.storage.managed.
+  (*caches)[settings_namespace::MANAGED] =
+      new ManagedValueStoreCache(context, factory, observers);
+#endif
+}
+
+}  // namespace extensions