Mojo: Add a threaded perf test for (local) message pipes.

mojo/public/tests/test_support.h

 // Copyright 2014 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.
 
 #ifndef MOJO_PUBLIC_TESTS_TEST_SUPPORT_H_
 #define MOJO_PUBLIC_TESTS_TEST_SUPPORT_H_
 
 // Note: This header should be compilable as C.
 
 #include "mojo/public/tests/test_support_export.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 MOJO_TEST_SUPPORT_EXPORT void MojoTestSupportLogPerfResult(
     const char* test_name,
     double value,
     const char* units);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
+#ifdef __cplusplus
+namespace mojo {
+namespace test {
+
+inline void LogPerfResult(const char* test_name,
+                          double value,
+                          const char* units) {
+  MojoTestSupportLogPerfResult(test_name, value, units);
+}
+
+}  // namespace test
+}  // namespace mojo
+#endif  // __cplusplus
+
 #endif  // MOJO_PUBLIC_TESTS_TEST_SUPPORT_H_