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diff --git a/security/sandbox/chromium/base/threading/platform_thread_internal_posix.h b/security/sandbox/chromium/base/threading/platform_thread_internal_posix.h
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index 0000000000..d248fa9bfd
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+++ b/security/sandbox/chromium/base/threading/platform_thread_internal_posix.h
@@ -0,0 +1,62 @@
+// 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_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_
+#define BASE_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_
+
+#include "base/base_export.h"
+#include "base/optional.h"
+#include "base/threading/platform_thread.h"
+#include "build/build_config.h"
+
+namespace base {
+
+namespace internal {
+
+struct ThreadPriorityToNiceValuePair {
+  ThreadPriority priority;
+  int nice_value;
+};
+// The elements must be listed in the order of increasing priority (lowest
+// priority first), that is, in the order of decreasing nice values (highest
+// nice value first).
+BASE_EXPORT extern
+const ThreadPriorityToNiceValuePair kThreadPriorityToNiceValueMap[4];
+
+// Returns the nice value matching |priority| based on the platform-specific
+// implementation of kThreadPriorityToNiceValueMap.
+int ThreadPriorityToNiceValue(ThreadPriority priority);
+
+// Returns the ThreadPrioirty matching |nice_value| based on the platform-
+// specific implementation of kThreadPriorityToNiceValueMap.
+BASE_EXPORT ThreadPriority NiceValueToThreadPriority(int nice_value);
+
+// If non-nullopt, this return value will be used as the platform-specific
+// result of CanIncreaseThreadPriority().
+Optional<bool> CanIncreaseCurrentThreadPriorityForPlatform(
+    ThreadPriority priority);
+
+// Allows platform specific tweaks to the generic POSIX solution for
+// SetCurrentThreadPriority(). Returns true if the platform-specific
+// implementation handled this |priority| change, false if the generic
+// implementation should instead proceed.
+bool SetCurrentThreadPriorityForPlatform(ThreadPriority priority);
+
+// If non-null, this return value will be used as the platform-specific result
+// of CanIncreaseThreadPriority().
+Optional<ThreadPriority> GetCurrentThreadPriorityForPlatform();
+
+#if defined(OS_LINUX)
+// Current thread id is cached in thread local storage for performance reasons.
+// In some rare cases it's important to clear that cache explicitly (e.g. after
+// going through clone() syscall which does not call pthread_atfork()
+// handlers).
+BASE_EXPORT void ClearTidCache();
+#endif  // defined(OS_LINUX)
+
+}  // namespace internal
+
+}  // namespace base
+
+#endif  // BASE_THREADING_PLATFORM_THREAD_INTERNAL_POSIX_H_