Split up extensions storage API implementations for sync and local storage.

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"
 
+#include "chrome/browser/extensions/api/storage/sync_value_store_cache.h"
+#include "content/public/browser/browser_context.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) {
+  // Add support for chrome.storage.sync.
+  (*caches)[settings_namespace::SYNC] =
+      new SyncValueStoreCache(factory, observers, context->GetPath());
+
 #if defined(ENABLE_CONFIGURATION_POLICY)
   // Add support for chrome.storage.managed.
   (*caches)[settings_namespace::MANAGED] =
       new ManagedValueStoreCache(context, factory, observers);
 #endif
 }
 
 }  // namespace extensions