Add Reset to ScopedClosureRunner.

base/callback_helpers.cc

Index: base/callback_helpers.cc
diff --git a/base/bind_helpers.cc b/base/callback_helpers.cc
similarity index 52%
copy from base/bind_helpers.cc
copy to base/callback_helpers.cc
index f2fc3bb0daaed9697a899b2e80f5322e1a074fe9..ef02b2bde0cdfed5dbd02cb97cabd246ea18d611 100644
--- a/base/bind_helpers.cc
+++ b/base/callback_helpers.cc
@@ -1,14 +1,14 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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/bind_helpers.h"
+#include "base/callback_helpers.h"
 
 #include "base/callback.h"
 
 namespace base {
 
-void DoNothing() {
+ScopedClosureRunner::ScopedClosureRunner() {
 }
 
 ScopedClosureRunner::ScopedClosureRunner(const Closure& closure)
@@ -20,6 +20,19 @@ ScopedClosureRunner::~ScopedClosureRunner() {
     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();