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diff --git a/ipc/chromium/src/base/platform_thread.h b/ipc/chromium/src/base/platform_thread.h
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+++ b/ipc/chromium/src/base/platform_thread.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.
+
+// WARNING: You should *NOT* be using this class directly.  PlatformThread is
+// the low-level platform-specific abstraction to the OS's threading interface.
+// You should instead be using a message-loop driven Thread, see thread.h.
+
+#ifndef BASE_PLATFORM_THREAD_H_
+#define BASE_PLATFORM_THREAD_H_
+
+#include "base/basictypes.h"
+
+// PlatformThreadHandle should not be assumed to be a numeric type, since the
+// standard intends to allow pthread_t to be a structure.  This means you
+// should not initialize it to a value, like 0.  If it's a member variable, the
+// constructor can safely "value initialize" using () in the initializer list.
+#if defined(OS_WIN)
+#include <windows.h>
+typedef DWORD PlatformThreadId;
+typedef void* PlatformThreadHandle;  // HANDLE
+#elif defined(OS_POSIX)
+#include <pthread.h>
+typedef pthread_t PlatformThreadHandle;
+#if defined(OS_LINUX) || defined(OS_OPENBSD) || defined(__GLIBC__)
+#include <unistd.h>
+typedef pid_t PlatformThreadId;
+#elif defined(OS_BSD)
+#include <sys/types.h>
+typedef lwpid_t PlatformThreadId;
+#elif defined(OS_MACOSX)
+#include <mach/mach.h>
+typedef mach_port_t PlatformThreadId;
+#endif
+#endif
+
+// A namespace for low-level thread functions.
+class PlatformThread {
+ public:
+  // Gets the current thread id, which may be useful for logging purposes.
+  static PlatformThreadId CurrentId();
+
+  // Yield the current thread so another thread can be scheduled.
+  static void YieldCurrentThread();
+
+  // Sleeps for the specified duration (units are milliseconds).
+  static void Sleep(int duration_ms);
+
+  // Sets the thread name visible to a debugger.  This has no effect otherwise.
+  static void SetName(const char* name);
+
+  // Implement this interface to run code on a background thread.  Your
+  // ThreadMain method will be called on the newly created thread.
+  class Delegate {
+   public:
+    virtual ~Delegate() {}
+    virtual void ThreadMain() = 0;
+  };
+
+  // Creates a new thread.  The |stack_size| parameter can be 0 to indicate
+  // that the default stack size should be used.  Upon success,
+  // |*thread_handle| will be assigned a handle to the newly created thread,
+  // and |delegate|'s ThreadMain method will be executed on the newly created
+  // thread.
+  // NOTE: When you are done with the thread handle, you must call Join to
+  // release system resources associated with the thread.  You must ensure that
+  // the Delegate object outlives the thread.
+  static bool Create(size_t stack_size, Delegate* delegate,
+                     PlatformThreadHandle* thread_handle);
+
+  // CreateNonJoinable() does the same thing as Create() except the thread
+  // cannot be Join()'d.  Therefore, it also does not output a
+  // PlatformThreadHandle.
+  static bool CreateNonJoinable(size_t stack_size, Delegate* delegate);
+
+  // Joins with a thread created via the Create function.  This function blocks
+  // the caller until the designated thread exits.  This will invalidate
+  // |thread_handle|.
+  static void Join(PlatformThreadHandle thread_handle);
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(PlatformThread);
+};
+
+#endif  // BASE_PLATFORM_THREAD_H_