Add ScopedClosureRunner.

base/task.h

Index: base/task.h
diff --git a/base/task.h b/base/task.h
index 4a33de0e1f5d0fa378ea016d91a056f772b2d6a7..69112c1cd7244875bec678061c36761236344808 100644
--- a/base/task.h
+++ b/base/task.h
@@ -7,6 +7,7 @@
 #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"
@@ -566,6 +567,19 @@ class BASE_EXPORT ScopedTaskRunner {
   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