Initial in-process implementation of some Mojo primitives.

mojo/system/test_utils.h

+// 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.
+
+#ifndef MOJO_SYSTEM_TEST_UTILS_H_
+#define MOJO_SYSTEM_TEST_UTILS_H_
+
+#include "base/basictypes.h"
+#include "base/time/time.h"
+
+namespace mojo {
+namespace system {
+namespace test {
+
+class Stopwatch {
+ public:
+  Stopwatch() {}
+  ~Stopwatch() {}
+
+  void Start() {
+    start_time_ = base::TimeTicks::HighResNow();
+  }
+
+  int64_t Elapsed() {
+    return (base::TimeTicks::HighResNow() - start_time_).InMicroseconds();
+  }
+
+ private:
+  base::TimeTicks start_time_;
+
+  DISALLOW_COPY_AND_ASSIGN(Stopwatch);
+};
+
+}  // namespace test
+}  // namespace system
+}  // namespace mojo
+
+#endif  // MOJO_SYSTEM_TEST_UTILS_H_