Really now... derive DomStorageTaskRunner from base::SequencedTaskRunner.

webkit/dom_storage/dom_storage_task_runner.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 WEBKIT_DOM_STORAGE_DOM_STORAGE_TASK_RUNNER_
 #define WEBKIT_DOM_STORAGE_DOM_STORAGE_TASK_RUNNER_
 #pragma once
 
 #include "base/memory/ref_counted.h"
-#include "base/task_runner.h"
+#include "base/sequenced_task_runner.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/time.h"
 
 namespace base {
 class MessageLoopProxy;
 }
 
 namespace dom_storage {
 
 // Tasks must run serially with respect to one another, but may
 // execute on different OS threads. The base class is implemented
 // in terms of a MessageLoopProxy.
-class DomStorageTaskRunner : public base::TaskRunner {
+class DomStorageTaskRunner : public base::SequencedTaskRunner {
  public:
   explicit DomStorageTaskRunner(base::MessageLoopProxy* message_loop);
   virtual ~DomStorageTaskRunner();
 
   // The PostTask() method, defined by TaskRunner, schedules a task
   // to run immediately.
 
   // Schedules a task to be run after a delay.
   virtual bool PostDelayedTask(
       const tracked_objects::Location& from_here,
       const base::Closure& task,
       base::TimeDelta delay) OVERRIDE;
 
   // DEPRECATED: Only here because base::TaskRunner requires it, implemented
   // by calling the virtual PostDelayedTask(..., TimeDelta) variant.
   virtual bool PostDelayedTask(
       const tracked_objects::Location& from_here,
       const base::Closure& task,
       int64 delay_ms) OVERRIDE;
 
   // Only here because base::TaskRunner requires it, the return
   // value is hard coded to true.
   virtual bool RunsTasksOnCurrentThread() const OVERRIDE;
 
+  // SequencedTaskRunner overrides, these are implemented in
+  // terms of PostDelayedTask and the later is similarly deprecated.
+  virtual bool PostNonNestableDelayedTask(
+      const tracked_objects::Location& from_here,
+      const base::Closure& task,
+      base::TimeDelta delay) OVERRIDE;
+  virtual bool PostNonNestableDelayedTask(
+      const tracked_objects::Location& from_here,
+      const base::Closure& task,
+      int64 delay_ms) OVERRIDE;
+
  protected:
   const scoped_refptr<base::MessageLoopProxy> message_loop_;
 };
 
 // A derived class that utlizes the SequenceWorkerPool under a
 // dom_storage specific SequenceToken. The MessageLoopProxy
 // is used to delay scheduling on the worker pool.
 class DomStorageWorkerPoolTaskRunner : public DomStorageTaskRunner {
  public:
   DomStorageWorkerPoolTaskRunner(
@@ skipping 25 matching lines @@
 
   virtual bool PostDelayedTask(
       const tracked_objects::Location& from_here,
       const base::Closure& task,
       base::TimeDelta delay) OVERRIDE;
 };
 
 }  // namespace dom_storage
 
 #endif  // WEBKIT_DOM_STORAGE_DOM_STORAGE_TASK_RUNNER_