components/metrics: Add runtime memory leak detector

components/metrics/leak_detector/leak_detector.h

+// Copyright (c) 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_
+
+#include <stdint.h>
+
+namespace leak_detector {
+
+class LeakDetector {
+ public:
+  // Singleton management functions.
+  static void Initialize();
+  static void Shutdown();
+  static bool IsInitialized();
+};
+
+}  // namespace leak_detector
+
+#endif  // COMPONENTS_METRICS_LEAK_DETECTOR_LEAK_DETECTOR_H_