diff -r 000000000000 -r 6474c204b198 security/sandbox/chromium/base/profiler/alternate_timer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/security/sandbox/chromium/base/profiler/alternate_timer.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,44 @@
+// 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.
+
+// This is a glue file, which allows third party code to call into our profiler
+// without having to include most any functions from base.
+
+#ifndef BASE_PROFILER_ALTERNATE_TIMER_H_
+#define BASE_PROFILER_ALTERNATE_TIMER_H_
+
+#include "base/base_export.h"
+
+namespace tracked_objects {
+
+enum TimeSourceType {
+  TIME_SOURCE_TYPE_WALL_TIME,
+  TIME_SOURCE_TYPE_TCMALLOC
+};
+
+// Provide type for an alternate timer function.
+typedef unsigned int NowFunction();
+
+// Environment variable name that is used to activate alternate timer profiling
+// (such as using TCMalloc allocations to provide a pseudo-timer) for tasks
+// instead of wall clock profiling.
+BASE_EXPORT extern const char kAlternateProfilerTime[];
+
+// Set an alternate timer function to replace the OS time function when
+// profiling.  Typically this is called by an allocator that is providing a
+// function that indicates how much memory has been allocated on any given
+// thread.
+BASE_EXPORT void SetAlternateTimeSource(NowFunction* now_function,
+                                        TimeSourceType type);
+
+// Gets the pointer to a function that was set via SetAlternateTimeSource().
+// Returns NULL if no set was done prior to calling GetAlternateTimeSource.
+NowFunction* GetAlternateTimeSource();
+
+// Returns the type of the currently set time source.
+BASE_EXPORT TimeSourceType GetTimeSourceType();
+
+}  // namespace tracked_objects
+
+#endif  // BASE_PROFILER_ALTERNATE_TIMER_H_