Add ScopedClosureRunner.

base/task.cc

 // 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.
 
 #include "base/task.h"
 
 Task::Task() {
 }
 
 Task::~Task() {
@@ skipping 16 matching lines @@
     delete task_;
   }
 }
 
 Task* ScopedTaskRunner::Release() {
   Task* tmp = task_;
   task_ = NULL;
   return tmp;
 }
 
+ScopedClosureRunner::ScopedClosureRunner(const Closure& closure)
+    : closure_(closure) {
+}
+
+ScopedClosureRunner::~ScopedClosureRunner() {
+  if (!closure_.is_null())
+    closure_.Run();
+}
+
+Closure ScopedClosureRunner::Release() {
+  Closure result = closure_;
+  closure_.Reset();
+  return result;
+}
+
 namespace subtle {
 
 TaskClosureAdapter::TaskClosureAdapter(Task* task)
     : task_(task),
       should_leak_task_(&kTaskLeakingDefault) {
 }
 
 TaskClosureAdapter::TaskClosureAdapter(Task* task, bool* should_leak_task)
     : task_(task),
       should_leak_task_(should_leak_task) {
@@ skipping 10 matching lines @@
   delete task_;
   task_ = NULL;
 }
 
 // Don't leak tasks by default.
 bool TaskClosureAdapter::kTaskLeakingDefault = false;
 
 }  // namespace subtle
 
 }  // namespace base