Add move constructor in ScopedClosureRunner.

base/callback_helpers.cc

 // Copyright 2013 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/callback_helpers.h"
 
 #include "base/callback.h"
 
 namespace base {
 
-ScopedClosureRunner::ScopedClosureRunner() {
-}
+ScopedClosureRunner::ScopedClosureRunner() {}
+
+ScopedClosureRunner::ScopedClosureRunner(ScopedClosureRunner&& other)
+    : closure_(other.Release()) {}
 
 ScopedClosureRunner::ScopedClosureRunner(const Closure& closure)
-    : closure_(closure) {
-}
+    : closure_(closure) {}
 
 ScopedClosureRunner::~ScopedClosureRunner() {
   if (!closure_.is_null())
     closure_.Run();
 }
 
 void ScopedClosureRunner::Reset() {
   Closure old_closure = Release();
   if (!old_closure.is_null())
     old_closure.Run();
 }
 
 void ScopedClosureRunner::Reset(const Closure& closure) {
   Closure old_closure = Release();
   closure_ = closure;
   if (!old_closure.is_null())
     old_closure.Run();
 }
 
 Closure ScopedClosureRunner::Release() {
   Closure result = closure_;
   closure_.Reset();
   return result;
 }
 
 }  // namespace base