Revert 119198 - First pass at implementing the MessageLoop interface. This includes a simple

ppapi/utility/threading/simple_thread.h

-// 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.
-
-#ifndef PPAPI_UTILITY_THREADING_SIMPLE_THREAD_H_
-#define PPAPI_UTILITY_THREADING_SIMPLE_THREAD_H_
-
-#ifdef WIN32
-#include <windows.h>
-#else
-#include <pthread.h>
-#endif
-
-#include "ppapi/cpp/dev/message_loop_dev.h"
-
-namespace pp {
-
-// This class is a simple wrapper around a pthread/Windows thread that creates
-// and runs a PPAPI message loop on that thread.
-class SimpleThread {
- public:
-#ifdef WIN32
-  typedef HANDLE ThreadHandle;
-#else
-  typedef pthread_t ThreadHandle;
-#endif
-
-  typedef void (*ThreadFunc)(MessageLoop_Dev&, void* user_data);
-
-  SimpleThread(Instance* instance);
-  ~SimpleThread();
-
-  // Starts a thread and runs a message loop in it. If you need control over
-  // how the message loop is run, use StartWithFunction. Returns true on
-  // success, false if the thread is already running or couldn't be started.
-  bool Start();
-
-  // Posts a quit message to the message loop and blocks until the thread
-  // exits. Returns true on success. If the thread is not running, returns
-  // false.
-  bool Join();
-
-  // Normally you can just use Start() to start a thread, and then post work to
-  // it. In some cases you will want control over the message. If ThreadFunc
-  // is NULL, this acts the same as Start().
-  bool StartWithFunction(ThreadFunc func, void* user_data);
-
-  MessageLoop_Dev& message_loop() { return message_loop_; }
-  ThreadHandle thread() const { return thread_; }
-
- private:
-  Instance* instance_;
-  MessageLoop_Dev message_loop_;
-
-  ThreadHandle thread_;
-
-  // Disallow (not implemented).
-  SimpleThread(const SimpleThread&);
-  SimpleThread& operator=(const SimpleThread&);
-};
-
-}  // namespace pp
-
-#endif  // PPAPI_UTILITY_THREADING_SIMPLE_THREAD_H_
-