Add ExtensionsApiClient interface, use it in the storage API SettingsFrontend

chrome/browser/extensions/api/chrome_extensions_api_client.cc

Index: chrome/browser/extensions/api/chrome_extensions_api_client.cc
diff --git a/chrome/browser/extensions/api/chrome_extensions_api_client.cc b/chrome/browser/extensions/api/chrome_extensions_api_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..63ce8fa64e4b2174c515a28464b928554aa1148b
--- /dev/null
+++ b/chrome/browser/extensions/api/chrome_extensions_api_client.cc
@@ -0,0 +1,29 @@
+// 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,
+    scoped_refptr<SettingsStorageFactory> factory,
+    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