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diff --git a/ipc/chromium/src/base/thread.h b/ipc/chromium/src/base/thread.h
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+++ b/ipc/chromium/src/base/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) 2006-2009 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_THREAD_H_
+#define BASE_THREAD_H_
+
+#include <stdint.h>
+#include <string>
+
+#include "base/message_loop.h"
+#include "base/platform_thread.h"
+
+namespace base {
+
+// A simple thread abstraction that establishes a MessageLoop on a new thread.
+// The consumer uses the MessageLoop of the thread to cause code to execute on
+// the thread.  When this object is destroyed the thread is terminated.  All
+// pending tasks queued on the thread's message loop will run to completion
+// before the thread is terminated.
+class Thread : PlatformThread::Delegate {
+ public:
+  struct Options {
+    // Specifies the type of message loop that will be allocated on the thread.
+    MessageLoop::Type message_loop_type;
+
+    // Specifies the maximum stack size that the thread is allowed to use.
+    // This does not necessarily correspond to the thread's initial stack size.
+    // A value of 0 indicates that the default maximum should be used.
+    size_t stack_size;
+
+    // Specifies the transient and permanent hang timeouts for background hang
+    // monitoring. A value of 0 indicates there is no timeout.
+    uint32_t transient_hang_timeout;
+    uint32_t permanent_hang_timeout;
+
+    Options()
+        : message_loop_type(MessageLoop::TYPE_DEFAULT)
+        , stack_size(0)
+        , transient_hang_timeout(0)
+        , permanent_hang_timeout(0) {}
+    Options(MessageLoop::Type type, size_t size)
+        : message_loop_type(type)
+        , stack_size(size)
+        , transient_hang_timeout(0)
+        , permanent_hang_timeout(0) {}
+  };
+
+  // Constructor.
+  // name is a display string to identify the thread.
+  explicit Thread(const char *name);
+
+  // Destroys the thread, stopping it if necessary.
+  //
+  // NOTE: If you are subclassing from Thread, and you wish for your CleanUp
+  // method to be called, then you need to call Stop() from your destructor.
+  //
+  virtual ~Thread();
+
+  // Starts the thread.  Returns true if the thread was successfully started;
+  // otherwise, returns false.  Upon successful return, the message_loop()
+  // getter will return non-null.
+  //
+  // Note: This function can't be called on Windows with the loader lock held;
+  // i.e. during a DllMain, global object construction or destruction, atexit()
+  // callback.
+  bool Start();
+
+  // Starts the thread. Behaves exactly like Start in addition to allow to
+  // override the default options.
+  //
+  // Note: This function can't be called on Windows with the loader lock held;
+  // i.e. during a DllMain, global object construction or destruction, atexit()
+  // callback.
+  bool StartWithOptions(const Options& options);
+
+  // Signals the thread to exit and returns once the thread has exited.  After
+  // this method returns, the Thread object is completely reset and may be used
+  // as if it were newly constructed (i.e., Start may be called again).
+  //
+  // Stop may be called multiple times and is simply ignored if the thread is
+  // already stopped.
+  //
+  // NOTE: This method is optional.  It is not strictly necessary to call this
+  // method as the Thread's destructor will take care of stopping the thread if
+  // necessary.
+  //
+  void Stop();
+
+  // Signals the thread to exit in the near future.
+  //
+  // WARNING: This function is not meant to be commonly used. Use at your own
+  // risk. Calling this function will cause message_loop() to become invalid in
+  // the near future. This function was created to workaround a specific
+  // deadlock on Windows with printer worker thread. In any other case, Stop()
+  // should be used.
+  //
+  // StopSoon should not be called multiple times as it is risky to do so. It
+  // could cause a timing issue in message_loop() access. Call Stop() to reset
+  // the thread object once it is known that the thread has quit.
+  void StopSoon();
+
+  // Returns the message loop for this thread.  Use the MessageLoop's
+  // PostTask methods to execute code on the thread.  This only returns
+  // non-null after a successful call to Start.  After Stop has been called,
+  // this will return NULL.
+  //
+  // NOTE: You must not call this MessageLoop's Quit method directly.  Use
+  // the Thread's Stop method instead.
+  //
+  MessageLoop* message_loop() const { return message_loop_; }
+
+  // Set the name of this thread (for display in debugger too).
+  const std::string &thread_name() { return name_; }
+
+  // The native thread handle.
+  PlatformThreadHandle thread_handle() { return thread_; }
+
+  // The thread ID.
+  PlatformThreadId thread_id() const { return thread_id_; }
+
+  // Reset thread ID as current thread.
+  PlatformThreadId reset_thread_id() {
+      thread_id_ = PlatformThread::CurrentId();
+      return thread_id_;
+  }
+
+  // Returns true if the thread has been started, and not yet stopped.
+  // When a thread is running, the thread_id_ is non-zero.
+  bool IsRunning() const { return thread_id_ != 0; }
+
+ protected:
+  // Called just prior to starting the message loop
+  virtual void Init() {}
+
+  // Called just after the message loop ends
+  virtual void CleanUp() {}
+
+  static void SetThreadWasQuitProperly(bool flag);
+  static bool GetThreadWasQuitProperly();
+
+ private:
+  // PlatformThread::Delegate methods:
+  virtual void ThreadMain();
+
+  // We piggy-back on the startup_data_ member to know if we successfully
+  // started the thread.  This way we know that we need to call Join.
+  bool thread_was_started() const { return startup_data_ != NULL; }
+
+  // Used to pass data to ThreadMain.
+  struct StartupData;
+  StartupData* startup_data_;
+
+  // The thread's handle.
+  PlatformThreadHandle thread_;
+
+  // The thread's message loop.  Valid only while the thread is alive.  Set
+  // by the created thread.
+  MessageLoop* message_loop_;
+
+  // Our thread's ID.
+  PlatformThreadId thread_id_;
+
+  // The name of the thread.  Used for debugging purposes.
+  std::string name_;
+
+  friend class ThreadQuitTask;
+
+  DISALLOW_COPY_AND_ASSIGN(Thread);
+};
+
+}  // namespace base
+
+#endif  // BASE_THREAD_H_