[Not for review] scoped_refptr move benchmark.

base/memory/ref_counted.h

Index: base/memory/ref_counted.h
diff --git a/base/memory/ref_counted.h b/base/memory/ref_counted.h
index 5f94b4c37ae2eb510176b585b30a9af20e216d32..ea37e8417a05a3981ff88ab3a19d4ab7357d5bb3 100644
--- a/base/memory/ref_counted.h
+++ b/base/memory/ref_counted.h
@@ -437,4 +437,16 @@ std::ostream& operator<<(std::ostream& out, const scoped_refptr<T>& p) {
   return out << p.get();
 }
 
+class ThreadUnsafe : public base::RefCounted<ThreadUnsafe> {
+ private:
+  friend class base::RefCounted<ThreadUnsafe>;
+};
+class ThreadSafe : public base::RefCountedThreadSafe<ThreadSafe> {
+ private:
+   friend class base::RefCountedThreadSafe<ThreadSafe>;
+};
+
+scoped_refptr<ThreadUnsafe> get_thread_unsafe();
+scoped_refptr<ThreadSafe> get_thread_safe();
+
 #endif  // BASE_MEMORY_REF_COUNTED_H_