Add ScopedClosureRunner.

base/task.h

 // Copyright (c) 2011 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 BASE_TASK_H_
 #define BASE_TASK_H_
 #pragma once
 
 #include "base/base_export.h"
+#include "base/callback.h"
 #include "base/debug/alias.h"
 #include "base/memory/raw_scoped_refptr_mismatch_checker.h"
 #include "base/memory/weak_ptr.h"
 #include "base/tuple.h"
 
 namespace base {
 const size_t kDeadTask = 0xDEAD7A53;
 }
 
 // Task ------------------------------------------------------------------------
@@ skipping 539 matching lines @@
   ~ScopedTaskRunner();
 
   Task* Release();
 
  private:
   Task* task_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ScopedTaskRunner);
 };
 
+class BASE_EXPORT ScopedClosureRunner {
+ public:
+  explicit ScopedClosureRunner(const Closure& closure);
+  ~ScopedClosureRunner();
+
+  Closure Release();
+
+ private:
+  Closure closure_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ScopedClosureRunner);
+};
+
 namespace subtle {
 
 // This class is meant for use in the implementation of MessageLoop classes
 // such as MessageLoop, MessageLoopProxy, BrowserThread, and WorkerPool to
 // implement the compatibility APIs while we are transitioning from Task to
 // Callback.
 //
 // It should NOT be used anywhere else!
 //
 // In particular, notice that this is RefCounted instead of
@@ skipping 21 matching lines @@
   Task* task_;
   bool* should_leak_task_;
   static bool kTaskLeakingDefault;
 };
 
 }  // namespace subtle
 
 }  // namespace base
 
 #endif  // BASE_TASK_H_