Implement the memory leak annotations for heap leak checker.

base/leak_annotations.h

Index: base/leak_annotations.h
diff --git a/base/leak_annotations.h b/base/leak_annotations.h
new file mode 100644
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+++ b/base/leak_annotations.h
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+// Copyright (c) 2006-2009 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 BASE_LEAK_ANNOTATIONS_H_
+#define BASE_LEAK_ANNOTATIONS_H_
+
+#if defined(LINUX_USE_TCMALLOC) && defined(LINUX_USE_HEAPCHECKER)
+
+#include "third_party/tcmalloc/heap-checker.h"
+
+// Annotate a program scope as having memory leaks. Tcmalloc's heap leak
+// checker will ignore them. Note that these annotations may mask real bugs
+// and should not be used in the production code.
+#define ANNOTATE_SCOPED_MEMORY_LEAK \
+    HeapLeakChecker::Disabler heap_leak_checker_disabler
+
+#else
+
+// If tcmalloc is not used, the annotations should be no-ops.
+#define ANNOTATE_SCOPED_MEMORY_LEAK
+
+#endif
+
+#endif  // BASE_LEAK_ANNOTATIONS_H_