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diff --git a/src/third_party/gperftools-2.7/dist/src/emergency_malloc.h b/src/third_party/gperftools-2.7/dist/src/emergency_malloc.h
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+++ b/src/third_party/gperftools-2.7/dist/src/emergency_malloc.h
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+// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
+// Copyright (c) 2014, gperftools Contributors
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef EMERGENCY_MALLOC_H
+#define EMERGENCY_MALLOC_H
+#include "config.h"
+
+#include <stddef.h>
+
+#include "base/basictypes.h"
+#include "common.h"
+
+namespace tcmalloc {
+  static const uintptr_t kEmergencyArenaShift = 20+4; // 16 megs
+  static const uintptr_t kEmergencyArenaSize = 1 << kEmergencyArenaShift;
+
+  extern __attribute__ ((visibility("internal"))) char *emergency_arena_start;
+  extern __attribute__ ((visibility("internal"))) uintptr_t emergency_arena_start_shifted;;
+
+  PERFTOOLS_DLL_DECL void *EmergencyMalloc(size_t size);
+  PERFTOOLS_DLL_DECL void EmergencyFree(void *p);
+  PERFTOOLS_DLL_DECL void *EmergencyCalloc(size_t n, size_t elem_size);
+  PERFTOOLS_DLL_DECL void *EmergencyRealloc(void *old_ptr, size_t new_size);
+
+  static inline bool IsEmergencyPtr(const void *_ptr) {
+    uintptr_t ptr = reinterpret_cast<uintptr_t>(_ptr);
+    return PREDICT_FALSE((ptr >> kEmergencyArenaShift) == emergency_arena_start_shifted)
+      && emergency_arena_start_shifted;
+  }
+
+} // namespace tcmalloc
+
+#endif