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diff --git a/ipc/chromium/src/base/lock_impl.h b/ipc/chromium/src/base/lock_impl.h
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+++ b/ipc/chromium/src/base/lock_impl.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+// Copyright (c) 2006-2008 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_LOCK_IMPL_H_
+#define BASE_LOCK_IMPL_H_
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#elif defined(OS_POSIX)
+#include <pthread.h>
+#endif
+
+#include "base/basictypes.h"
+#include "base/platform_thread.h"
+
+// This class implements the underlying platform-specific spin-lock mechanism
+// used for the Lock class.  Most users should not use LockImpl directly, but
+// should instead use Lock.
+class LockImpl {
+ public:
+#if defined(OS_WIN)
+  typedef CRITICAL_SECTION OSLockType;
+#elif defined(OS_POSIX)
+  typedef pthread_mutex_t OSLockType;
+#endif
+
+  LockImpl();
+  ~LockImpl();
+
+  // If the lock is not held, take it and return true.  If the lock is already
+  // held by something else, immediately return false.
+  bool Try();
+
+  // Take the lock, blocking until it is available if necessary.
+  void Lock();
+
+  // Release the lock.  This must only be called by the lock's holder: after
+  // a successful call to Try, or a call to Lock.
+  void Unlock();
+
+  // Debug-only method that will DCHECK() if the lock is not acquired by the
+  // current thread.  In non-debug builds, no check is performed.
+  // Because linux and mac condition variables modify the underlyning lock
+  // through the os_lock() method, runtime assertions can not be done on those
+  // builds.
+#if defined(NDEBUG) || !defined(OS_WIN)
+  void AssertAcquired() const {}
+#else
+  void AssertAcquired() const;
+#endif
+
+  // Return the native underlying lock.  Not supported for Windows builds.
+  // TODO(awalker): refactor lock and condition variables so that this is
+  // unnecessary.
+#if !defined(OS_WIN)
+  OSLockType* os_lock() { return &os_lock_; }
+#endif
+
+ private:
+  OSLockType os_lock_;
+
+#if !defined(NDEBUG) && defined(OS_WIN)
+  // All private data is implicitly protected by lock_.
+  // Be VERY careful to only access members under that lock.
+  PlatformThreadId owning_thread_id_;
+  int32_t recursion_count_shadow_;
+  bool recursion_used_;      // Allow debugging to continued after a DCHECK().
+#endif  // NDEBUG
+
+  DISALLOW_COPY_AND_ASSIGN(LockImpl);
+};
+
+
+#endif  // BASE_LOCK_IMPL_H_