Add an experiment to redirect DOMStorageTaskRunner to TaskScheduler.

content/browser/dom_storage/dom_storage_context_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_IMPL_H_
 #define CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_IMPL_H_
 
 #include <stdint.h>
 
 #include <deque>
@@ skipping 94 matching lines @@
     // Purge aggressively, i.e. discard cache even for areas that have
     // non-zero open count.
     PURGE_AGGRESSIVE,
   };
 
   // |localstorage_directory| and |sessionstorage_directory| may be empty
   // for incognito browser contexts.
   DOMStorageContextImpl(const base::FilePath& localstorage_directory,
                         const base::FilePath& sessionstorage_directory,
                         storage::SpecialStoragePolicy* special_storage_policy,
-                        DOMStorageTaskRunner* task_runner);
+                        scoped_refptr<DOMStorageTaskRunner> task_runner);
 
   // Returns the directory path for localStorage, or an empty directory, if
   // there is no backing on disk.
   const base::FilePath& localstorage_directory() {
     return localstorage_directory_;
   }
 
   // Returns the directory path for sessionStorage, or an empty directory, if
   // there is no backing on disk.
   const base::FilePath& sessionstorage_directory() {
@@ skipping 142 matching lines @@
   // sessionStorage.
   std::map<std::string, int64_t> persistent_namespace_id_to_namespace_id_;
 
   // For cleaning up unused databases more aggressively.
   bool is_low_end_device_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOM_STORAGE_DOM_STORAGE_CONTEXT_IMPL_H_