components/metrics: Add runtime memory leak detector

components/metrics/leak_detector/leak_detector.h

Index: components/metrics/leak_detector/leak_detector.h
diff --git a/components/metrics/leak_detector/leak_detector.h b/components/metrics/leak_detector/leak_detector.h
new file mode 100644
index 0000000000000000000000000000000000000000..7d88ea9d16cd9ab44accc2286af71d1b341fc73b
--- /dev/null
+++ b/components/metrics/leak_detector/leak_detector.h
@@ -0,0 +1,23 @@
+// Copyright 2015 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 COMPONENTS_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_H_
+#define COMPONENTS_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_H_
+
+namespace metrics {
+namespace leak_detector {
+
+// The top level leak detector is a singleton instance. Implement it as a
+// namespace with init/shutdown functions rather than as a class with static
+// member functions.
+
+void Initialize();
+void Shutdown();
+
+bool IsInitialized();
+
+}  // namespace leak_detector
+}  // namespace metrics
+
+#endif  // COMPONENTS_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_H_