Implement SequenceChecker, which is a generalization of ThreadChecker

base/sequence_checker_unittest.cc

Index: base/sequence_checker_unittest.cc
diff --git a/base/sequence_checker_unittest.cc b/base/sequence_checker_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4fc3027cf820f9563cd25e2c916fe0f65277c2c6
--- /dev/null
+++ b/base/sequence_checker_unittest.cc
@@ -0,0 +1,29 @@
+// Copyright (c) 2012 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/sequence_checker.h"
+
+#include <cstddef>
+
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/test/null_task_runner.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace base {
+
+namespace {
+
+// Call various methods of SequenceChecker to make sure nothing blows
+// up in either debug or release mode.
+TEST(SequenceCheckerTest, Basic) {
+  SequenceChecker sequence_checker(new NullTaskRunner());
+  sequence_checker.CalledOnValidSequence();
+  sequence_checker.ChangeSequence(NULL);
+  sequence_checker.CalledOnValidSequence();
+}
+
+}  // namespace
+
+}  // namespace base