Add run-time CHECK to smoke-test allocator overrides

base/allocator/allocator_check.cc

+// 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/allocator/allocator_check.h"
+
+#include "build/build_config.h"
+
+#if defined(OS_LINUX)
+#include <malloc.h>
+#endif
+
+namespace base {
+namespace allocator {
+
+// Defined in allocator_shim_win.cc .
+// TODO(primiano): replace with an include once base can depend on allocator.
+#if defined(OS_WIN) && defined(ALLOCATOR_SHIM)
+extern bool g_is_win_shim_layer_initialized;
+#endif
+
+bool IsAllocatorInitialized() {
+#if defined(OS_WIN) && defined(ALLOCATOR_SHIM)
+  // Set by allocator_shim_win.cc when the shimmed _heap_init() is called.
+  return g_is_win_shim_layer_initialized;
+#elif defined(OS_LINUX) && defined(USE_TCMALLOC)
+// From third_party/tcmalloc/chromium/src/gperftools/tcmalloc.h.
+// TODO(primiano): replace with an include once base can depend on allocator.
+#define TC_MALLOPT_IS_OVERRIDDEN_BY_TCMALLOC 0xbeef42
+  return (mallopt(TC_MALLOPT_IS_OVERRIDDEN_BY_TCMALLOC, 0) ==
+          TC_MALLOPT_IS_OVERRIDDEN_BY_TCMALLOC);
+#else
+  return true;
+#endif
+}
+
+}  // namespace allocator
+}  // namespace base