Update from https://crrev.com/327068

base/test/malloc_wrapper.h

Index: base/test/malloc_wrapper.h
diff --git a/base/test/malloc_wrapper.h b/base/test/malloc_wrapper.h
new file mode 100644
index 0000000000000000000000000000000000000000..0fa7dbb500676bdcce747e1253df05a8633f70a6
--- /dev/null
+++ b/base/test/malloc_wrapper.h
@@ -0,0 +1,21 @@
+// 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 BASE_TEST_MALLOC_WRAPPER_H_
+#define BASE_TEST_MALLOC_WRAPPER_H_
+
+#include "base/basictypes.h"
+
+// BASE_EXPORT depends on COMPONENT_BUILD.
+// This will always be a separate shared library, so don't use BASE_EXPORT here.
+#if defined(WIN32)
+#define MALLOC_WRAPPER_EXPORT __declspec(dllexport)
+#else
+#define MALLOC_WRAPPER_EXPORT __attribute__((visibility("default")))
+#endif  // defined(WIN32)
+
+// Calls malloc directly.
+MALLOC_WRAPPER_EXPORT void* MallocWrapper(size_t size);
+
+#endif  // BASE_TEST_MALLOC_WRAPPER_H_