Add ref count to service workers for extension API.

extensions/browser/extension_util.h

 // 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.
 
 #ifndef EXTENSIONS_BROWSER_EXTENSION_UTIL_H_
 #define EXTENSIONS_BROWSER_EXTENSION_UTIL_H_
 
 #include <string>
 
 class GURL;
 
 namespace content {
 class BrowserContext;
+class StoragePartition;
 }
 
 namespace extensions {
 class Extension;
 struct ExtensionInfo;
 
 namespace util {
 
 // TODO(benwells): Move functions from
 // chrome/browser/extensions/extension_util.h/cc that are only dependent on
 // extensions/ here.
 
 // Returns true if the extension has isolated storage.
 bool HasIsolatedStorage(const ExtensionInfo& info);
 
 // Returns true if the site URL corresponds to an extension or app and has
 // isolated storage.
 bool SiteHasIsolatedStorage(const GURL& extension_site_url,
                             content::BrowserContext* context);
 
 // Returns true if the extension can be enabled in incognito mode.
 bool CanBeIncognitoEnabled(const Extension* extension);
 
+content::StoragePartition* GetStoragePartitionForExtensionId(
+    const std::string& extension_id,
+    content::BrowserContext* browser_context);
+
 }  // namespace util
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_UTIL_H_