Move base to DEPS

base/message_loop/message_loop.h

Index: base/message_loop/message_loop.h
diff --git a/base/message_loop/message_loop.h b/base/message_loop/message_loop.h
deleted file mode 100644
index fbb8309c203275768188b499ef5d5e8102a751e9..0000000000000000000000000000000000000000
--- a/base/message_loop/message_loop.h
+++ /dev/null
@@ -1,696 +0,0 @@
-// Copyright 2013 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_MESSAGE_LOOP_MESSAGE_LOOP_H_
-#define BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_
-
-#include <queue>
-#include <string>
-
-#include "base/base_export.h"
-#include "base/basictypes.h"
-#include "base/callback_forward.h"
-#include "base/debug/task_annotator.h"
-#include "base/location.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop/incoming_task_queue.h"
-#include "base/message_loop/message_loop_task_runner.h"
-#include "base/message_loop/message_pump.h"
-#include "base/message_loop/timer_slack.h"
-#include "base/observer_list.h"
-#include "base/pending_task.h"
-#include "base/sequenced_task_runner_helpers.h"
-#include "base/synchronization/lock.h"
-#include "base/time/time.h"
-#include "base/tracking_info.h"
-
-// TODO(sky): these includes should not be necessary. Nuke them.
-#if defined(OS_WIN)
-#include "base/message_loop/message_pump_win.h"
-#elif defined(OS_IOS)
-#include "base/message_loop/message_pump_io_ios.h"
-#elif defined(OS_POSIX)
-#include "base/message_loop/message_pump_libevent.h"
-#endif
-
-namespace base {
-
-class HistogramBase;
-class RunLoop;
-class ThreadTaskRunnerHandle;
-class WaitableEvent;
-
-// A MessageLoop is used to process events for a particular thread.  There is
-// at most one MessageLoop instance per thread.
-//
-// Events include at a minimum Task instances submitted to PostTask and its
-// variants.  Depending on the type of message pump used by the MessageLoop
-// other events such as UI messages may be processed.  On Windows APC calls (as
-// time permits) and signals sent to a registered set of HANDLEs may also be
-// processed.
-//
-// NOTE: Unless otherwise specified, a MessageLoop's methods may only be called
-// on the thread where the MessageLoop's Run method executes.
-//
-// NOTE: MessageLoop has task reentrancy protection.  This means that if a
-// task is being processed, a second task cannot start until the first task is
-// finished.  Reentrancy can happen when processing a task, and an inner
-// message pump is created.  That inner pump then processes native messages
-// which could implicitly start an inner task.  Inner message pumps are created
-// with dialogs (DialogBox), common dialogs (GetOpenFileName), OLE functions
-// (DoDragDrop), printer functions (StartDoc) and *many* others.
-//
-// Sample workaround when inner task processing is needed:
-//   HRESULT hr;
-//   {
-//     MessageLoop::ScopedNestableTaskAllower allow(MessageLoop::current());
-//     hr = DoDragDrop(...); // Implicitly runs a modal message loop.
-//   }
-//   // Process |hr| (the result returned by DoDragDrop()).
-//
-// Please be SURE your task is reentrant (nestable) and all global variables
-// are stable and accessible before calling SetNestableTasksAllowed(true).
-//
-class BASE_EXPORT MessageLoop : public MessagePump::Delegate {
- public:
-  // A MessageLoop has a particular type, which indicates the set of
-  // asynchronous events it may process in addition to tasks and timers.
-  //
-  // TYPE_DEFAULT
-  //   This type of ML only supports tasks and timers.
-  //
-  // TYPE_UI
-  //   This type of ML also supports native UI events (e.g., Windows messages).
-  //   See also MessageLoopForUI.
-  //
-  // TYPE_IO
-  //   This type of ML also supports asynchronous IO.  See also
-  //   MessageLoopForIO.
-  //
-  // TYPE_JAVA
-  //   This type of ML is backed by a Java message handler which is responsible
-  //   for running the tasks added to the ML. This is only for use on Android.
-  //   TYPE_JAVA behaves in essence like TYPE_UI, except during construction
-  //   where it does not use the main thread specific pump factory.
-  //
-  // TYPE_CUSTOM
-  //   MessagePump was supplied to constructor.
-  //
-  enum Type {
-    TYPE_DEFAULT,
-    TYPE_UI,
-    TYPE_CUSTOM,
-    TYPE_IO,
-#if defined(OS_ANDROID)
-    TYPE_JAVA,
-#endif  // defined(OS_ANDROID)
-  };
-
-  // Normally, it is not necessary to instantiate a MessageLoop.  Instead, it
-  // is typical to make use of the current thread's MessageLoop instance.
-  explicit MessageLoop(Type type = TYPE_DEFAULT);
-  // Creates a TYPE_CUSTOM MessageLoop with the supplied MessagePump, which must
-  // be non-NULL.
-  explicit MessageLoop(scoped_ptr<MessagePump> pump);
-
-  ~MessageLoop() override;
-
-  // Returns the MessageLoop object for the current thread, or null if none.
-  static MessageLoop* current();
-
-  static void EnableHistogrammer(bool enable_histogrammer);
-
-  typedef scoped_ptr<MessagePump> (MessagePumpFactory)();
-  // Uses the given base::MessagePumpForUIFactory to override the default
-  // MessagePump implementation for 'TYPE_UI'. Returns true if the factory
-  // was successfully registered.
-  static bool InitMessagePumpForUIFactory(MessagePumpFactory* factory);
-
-  // Creates the default MessagePump based on |type|. Caller owns return
-  // value.
-  static scoped_ptr<MessagePump> CreateMessagePumpForType(Type type);
-  // A DestructionObserver is notified when the current MessageLoop is being
-  // destroyed.  These observers are notified prior to MessageLoop::current()
-  // being changed to return NULL.  This gives interested parties the chance to
-  // do final cleanup that depends on the MessageLoop.
-  //
-  // NOTE: Any tasks posted to the MessageLoop during this notification will
-  // not be run.  Instead, they will be deleted.
-  //
-  class BASE_EXPORT DestructionObserver {
-   public:
-    virtual void WillDestroyCurrentMessageLoop() = 0;
-
-   protected:
-    virtual ~DestructionObserver();
-  };
-
-  // Add a DestructionObserver, which will start receiving notifications
-  // immediately.
-  void AddDestructionObserver(DestructionObserver* destruction_observer);
-
-  // Remove a DestructionObserver.  It is safe to call this method while a
-  // DestructionObserver is receiving a notification callback.
-  void RemoveDestructionObserver(DestructionObserver* destruction_observer);
-
-  // NOTE: Deprecated; prefer task_runner() and the TaskRunner interfaces.
-  // TODO(skyostil): Remove these functions (crbug.com/465354).
-  //
-  // The "PostTask" family of methods call the task's Run method asynchronously
-  // from within a message loop at some point in the future.
-  //
-  // With the PostTask variant, tasks are invoked in FIFO order, inter-mixed
-  // with normal UI or IO event processing.  With the PostDelayedTask variant,
-  // tasks are called after at least approximately 'delay_ms' have elapsed.
-  //
-  // The NonNestable variants work similarly except that they promise never to
-  // dispatch the task from a nested invocation of MessageLoop::Run.  Instead,
-  // such tasks get deferred until the top-most MessageLoop::Run is executing.
-  //
-  // The MessageLoop takes ownership of the Task, and deletes it after it has
-  // been Run().
-  //
-  // PostTask(from_here, task) is equivalent to
-  // PostDelayedTask(from_here, task, 0).
-  //
-  // NOTE: These methods may be called on any thread.  The Task will be invoked
-  // on the thread that executes MessageLoop::Run().
-  void PostTask(const tracked_objects::Location& from_here,
-                const Closure& task);
-
-  void PostDelayedTask(const tracked_objects::Location& from_here,
-                       const Closure& task,
-                       TimeDelta delay);
-
-  void PostNonNestableTask(const tracked_objects::Location& from_here,
-                           const Closure& task);
-
-  void PostNonNestableDelayedTask(const tracked_objects::Location& from_here,
-                                  const Closure& task,
-                                  TimeDelta delay);
-
-  // A variant on PostTask that deletes the given object.  This is useful
-  // if the object needs to live until the next run of the MessageLoop (for
-  // example, deleting a RenderProcessHost from within an IPC callback is not
-  // good).
-  //
-  // NOTE: This method may be called on any thread.  The object will be deleted
-  // on the thread that executes MessageLoop::Run().
-  template <class T>
-  void DeleteSoon(const tracked_objects::Location& from_here, const T* object) {
-    base::subtle::DeleteHelperInternal<T, void>::DeleteViaSequencedTaskRunner(
-        this, from_here, object);
-  }
-
-  // A variant on PostTask that releases the given reference counted object
-  // (by calling its Release method).  This is useful if the object needs to
-  // live until the next run of the MessageLoop, or if the object needs to be
-  // released on a particular thread.
-  //
-  // A common pattern is to manually increment the object's reference count
-  // (AddRef), clear the pointer, then issue a ReleaseSoon.  The reference count
-  // is incremented manually to ensure clearing the pointer does not trigger a
-  // delete and to account for the upcoming decrement (ReleaseSoon).  For
-  // example:
-  //
-  // scoped_refptr<Foo> foo = ...
-  // foo->AddRef();
-  // Foo* raw_foo = foo.get();
-  // foo = NULL;
-  // message_loop->ReleaseSoon(raw_foo);
-  //
-  // NOTE: This method may be called on any thread.  The object will be
-  // released (and thus possibly deleted) on the thread that executes
-  // MessageLoop::Run().  If this is not the same as the thread that calls
-  // ReleaseSoon(FROM_HERE, ), then T MUST inherit from
-  // RefCountedThreadSafe<T>!
-  template <class T>
-  void ReleaseSoon(const tracked_objects::Location& from_here,
-                   const T* object) {
-    base::subtle::ReleaseHelperInternal<T, void>::ReleaseViaSequencedTaskRunner(
-        this, from_here, object);
-  }
-
-  // Deprecated: use RunLoop instead.
-  // Run the message loop.
-  void Run();
-
-  // Deprecated: use RunLoop instead.
-  // Process all pending tasks, windows messages, etc., but don't wait/sleep.
-  // Return as soon as all items that can be run are taken care of.
-  void RunUntilIdle();
-
-  // TODO(jbates) remove this. crbug.com/131220. See QuitWhenIdle().
-  void Quit() { QuitWhenIdle(); }
-
-  // Deprecated: use RunLoop instead.
-  //
-  // Signals the Run method to return when it becomes idle. It will continue to
-  // process pending messages and future messages as long as they are enqueued.
-  // Warning: if the MessageLoop remains busy, it may never quit. Only use this
-  // Quit method when looping procedures (such as web pages) have been shut
-  // down.
-  //
-  // This method may only be called on the same thread that called Run, and Run
-  // must still be on the call stack.
-  //
-  // Use QuitClosure variants if you need to Quit another thread's MessageLoop,
-  // but note that doing so is fairly dangerous if the target thread makes
-  // nested calls to MessageLoop::Run.  The problem being that you won't know
-  // which nested run loop you are quitting, so be careful!
-  void QuitWhenIdle();
-
-  // Deprecated: use RunLoop instead.
-  //
-  // This method is a variant of Quit, that does not wait for pending messages
-  // to be processed before returning from Run.
-  void QuitNow();
-
-  // TODO(jbates) remove this. crbug.com/131220. See QuitWhenIdleClosure().
-  static Closure QuitClosure() { return QuitWhenIdleClosure(); }
-
-  // Deprecated: use RunLoop instead.
-  // Construct a Closure that will call QuitWhenIdle(). Useful to schedule an
-  // arbitrary MessageLoop to QuitWhenIdle.
-  static Closure QuitWhenIdleClosure();
-
-  // Set the timer slack for this message loop.
-  void SetTimerSlack(TimerSlack timer_slack) {
-    pump_->SetTimerSlack(timer_slack);
-  }
-
-  // Returns true if this loop is |type|. This allows subclasses (especially
-  // those in tests) to specialize how they are identified.
-  virtual bool IsType(Type type) const;
-
-  // Returns the type passed to the constructor.
-  Type type() const { return type_; }
-
-  // Optional call to connect the thread name with this loop.
-  void set_thread_name(const std::string& thread_name) {
-    DCHECK(thread_name_.empty()) << "Should not rename this thread!";
-    thread_name_ = thread_name;
-  }
-  const std::string& thread_name() const { return thread_name_; }
-
-  // Gets the TaskRunner associated with this message loop.
-  const scoped_refptr<SingleThreadTaskRunner>& task_runner() {
-    return task_runner_;
-  }
-
-  // Sets a new TaskRunner for this message loop. The message loop must already
-  // have been bound to a thread prior to this call, and the task runner must
-  // belong to that thread. Note that changing the task runner will also affect
-  // the ThreadTaskRunnerHandle for the target thread. Must be called on the
-  // thread to which the message loop is bound.
-  void SetTaskRunner(scoped_refptr<SingleThreadTaskRunner> task_runner);
-
-  // Enables or disables the recursive task processing. This happens in the case
-  // of recursive message loops. Some unwanted message loop may occurs when
-  // using common controls or printer functions. By default, recursive task
-  // processing is disabled.
-  //
-  // Please utilize |ScopedNestableTaskAllower| instead of calling these methods
-  // directly.  In general nestable message loops are to be avoided.  They are
-  // dangerous and difficult to get right, so please use with extreme caution.
-  //
-  // The specific case where tasks get queued is:
-  // - The thread is running a message loop.
-  // - It receives a task #1 and execute it.
-  // - The task #1 implicitly start a message loop, like a MessageBox in the
-  //   unit test. This can also be StartDoc or GetSaveFileName.
-  // - The thread receives a task #2 before or while in this second message
-  //   loop.
-  // - With NestableTasksAllowed set to true, the task #2 will run right away.
-  //   Otherwise, it will get executed right after task #1 completes at "thread
-  //   message loop level".
-  void SetNestableTasksAllowed(bool allowed);
-  bool NestableTasksAllowed() const;
-
-  // Enables nestable tasks on |loop| while in scope.
-  class ScopedNestableTaskAllower {
-   public:
-    explicit ScopedNestableTaskAllower(MessageLoop* loop)
-        : loop_(loop),
-          old_state_(loop_->NestableTasksAllowed()) {
-      loop_->SetNestableTasksAllowed(true);
-    }
-    ~ScopedNestableTaskAllower() {
-      loop_->SetNestableTasksAllowed(old_state_);
-    }
-
-   private:
-    MessageLoop* loop_;
-    bool old_state_;
-  };
-
-  // Returns true if we are currently running a nested message loop.
-  bool IsNested();
-
-  // A TaskObserver is an object that receives task notifications from the
-  // MessageLoop.
-  //
-  // NOTE: A TaskObserver implementation should be extremely fast!
-  class BASE_EXPORT TaskObserver {
-   public:
-    TaskObserver();
-
-    // This method is called before processing a task.
-    virtual void WillProcessTask(const PendingTask& pending_task) = 0;
-
-    // This method is called after processing a task.
-    virtual void DidProcessTask(const PendingTask& pending_task) = 0;
-
-   protected:
-    virtual ~TaskObserver();
-  };
-
-  // These functions can only be called on the same thread that |this| is
-  // running on.
-  void AddTaskObserver(TaskObserver* task_observer);
-  void RemoveTaskObserver(TaskObserver* task_observer);
-
-#if defined(OS_WIN)
-  void set_os_modal_loop(bool os_modal_loop) {
-    os_modal_loop_ = os_modal_loop;
-  }
-
-  bool os_modal_loop() const {
-    return os_modal_loop_;
-  }
-#endif  // OS_WIN
-
-  // Can only be called from the thread that owns the MessageLoop.
-  bool is_running() const;
-
-  // Returns true if the message loop has high resolution timers enabled.
-  // Provided for testing.
-  bool HasHighResolutionTasks();
-
-  // Returns true if the message loop is "idle". Provided for testing.
-  bool IsIdleForTesting();
-
-  // Returns the TaskAnnotator which is used to add debug information to posted
-  // tasks.
-  debug::TaskAnnotator* task_annotator() { return &task_annotator_; }
-
-  // Runs the specified PendingTask.
-  void RunTask(const PendingTask& pending_task);
-
-  //----------------------------------------------------------------------------
- protected:
-  scoped_ptr<MessagePump> pump_;
-
- private:
-  friend class RunLoop;
-  friend class internal::IncomingTaskQueue;
-  friend class ScheduleWorkTest;
-  friend class Thread;
-
-  using MessagePumpFactoryCallback = Callback<scoped_ptr<MessagePump>()>;
-
-  // Creates a MessageLoop without binding to a thread.
-  // If |type| is TYPE_CUSTOM non-null |pump_factory| must be also given
-  // to create a message pump for this message loop.  Otherwise a default
-  // message pump for the |type| is created.
-  //
-  // It is valid to call this to create a new message loop on one thread,
-  // and then pass it to the thread where the message loop actually runs.
-  // The message loop's BindToCurrentThread() method must be called on the
-  // thread the message loop runs on, before calling Run().
-  // Before BindToCurrentThread() is called only Post*Task() functions can
-  // be called on the message loop.
-  static scoped_ptr<MessageLoop> CreateUnbound(
-      Type type,
-      MessagePumpFactoryCallback pump_factory);
-
-  // Common private constructor. Other constructors delegate the initialization
-  // to this constructor.
-  MessageLoop(Type type, MessagePumpFactoryCallback pump_factory);
-
-  // Configure various members and bind this message loop to the current thread.
-  void BindToCurrentThread();
-
-  // Sets the ThreadTaskRunnerHandle for the current thread to point to the
-  // task runner for this message loop.
-  void SetThreadTaskRunnerHandle();
-
-  // Invokes the actual run loop using the message pump.
-  void RunHandler();
-
-  // Called to process any delayed non-nestable tasks.
-  bool ProcessNextDelayedNonNestableTask();
-
-  // Calls RunTask or queues the pending_task on the deferred task list if it
-  // cannot be run right now.  Returns true if the task was run.
-  bool DeferOrRunPendingTask(const PendingTask& pending_task);
-
-  // Adds the pending task to delayed_work_queue_.
-  void AddToDelayedWorkQueue(const PendingTask& pending_task);
-
-  // Delete tasks that haven't run yet without running them.  Used in the
-  // destructor to make sure all the task's destructors get called.  Returns
-  // true if some work was done.
-  bool DeletePendingTasks();
-
-  // Loads tasks from the incoming queue to |work_queue_| if the latter is
-  // empty.
-  void ReloadWorkQueue();
-
-  // Wakes up the message pump. Can be called on any thread. The caller is
-  // responsible for synchronizing ScheduleWork() calls.
-  void ScheduleWork();
-
-  // Start recording histogram info about events and action IF it was enabled
-  // and IF the statistics recorder can accept a registration of our histogram.
-  void StartHistogrammer();
-
-  // Add occurrence of event to our histogram, so that we can see what is being
-  // done in a specific MessageLoop instance (i.e., specific thread).
-  // If message_histogram_ is NULL, this is a no-op.
-  void HistogramEvent(int event);
-
-  // MessagePump::Delegate methods:
-  bool DoWork() override;
-  bool DoDelayedWork(TimeTicks* next_delayed_work_time) override;
-  bool DoIdleWork() override;
-
-  const Type type_;
-
-  // A list of tasks that need to be processed by this instance.  Note that
-  // this queue is only accessed (push/pop) by our current thread.
-  TaskQueue work_queue_;
-
-#if defined(OS_WIN)
-  // How many high resolution tasks are in the pending task queue. This value
-  // increases by N every time we call ReloadWorkQueue() and decreases by 1
-  // every time we call RunTask() if the task needs a high resolution timer.
-  int pending_high_res_tasks_;
-  // Tracks if we have requested high resolution timers. Its only use is to
-  // turn off the high resolution timer upon loop destruction.
-  bool in_high_res_mode_;
-#endif
-
-  // Contains delayed tasks, sorted by their 'delayed_run_time' property.
-  DelayedTaskQueue delayed_work_queue_;
-
-  // A recent snapshot of Time::Now(), used to check delayed_work_queue_.
-  TimeTicks recent_time_;
-
-  // A queue of non-nestable tasks that we had to defer because when it came
-  // time to execute them we were in a nested message loop.  They will execute
-  // once we're out of nested message loops.
-  TaskQueue deferred_non_nestable_work_queue_;
-
-  ObserverList<DestructionObserver> destruction_observers_;
-
-  // A recursion block that prevents accidentally running additional tasks when
-  // insider a (accidentally induced?) nested message pump.
-  bool nestable_tasks_allowed_;
-
-#if defined(OS_WIN)
-  // Should be set to true before calling Windows APIs like TrackPopupMenu, etc
-  // which enter a modal message loop.
-  bool os_modal_loop_;
-#endif
-
-  // pump_factory_.Run() is called to create a message pump for this loop
-  // if type_ is TYPE_CUSTOM and pump_ is null.
-  MessagePumpFactoryCallback pump_factory_;
-
-  std::string thread_name_;
-  // A profiling histogram showing the counts of various messages and events.
-  HistogramBase* message_histogram_;
-
-  RunLoop* run_loop_;
-
-  ObserverList<TaskObserver> task_observers_;
-
-  debug::TaskAnnotator task_annotator_;
-
-  scoped_refptr<internal::IncomingTaskQueue> incoming_task_queue_;
-
-  // A task runner which we haven't bound to a thread yet.
-  scoped_refptr<internal::MessageLoopTaskRunner> unbound_task_runner_;
-
-  // The task runner associated with this message loop.
-  scoped_refptr<SingleThreadTaskRunner> task_runner_;
-  scoped_ptr<ThreadTaskRunnerHandle> thread_task_runner_handle_;
-
-  template <class T, class R> friend class base::subtle::DeleteHelperInternal;
-  template <class T, class R> friend class base::subtle::ReleaseHelperInternal;
-
-  void DeleteSoonInternal(const tracked_objects::Location& from_here,
-                          void(*deleter)(const void*),
-                          const void* object);
-  void ReleaseSoonInternal(const tracked_objects::Location& from_here,
-                           void(*releaser)(const void*),
-                           const void* object);
-
-  DISALLOW_COPY_AND_ASSIGN(MessageLoop);
-};
-
-#if !defined(OS_NACL)
-
-//-----------------------------------------------------------------------------
-// MessageLoopForUI extends MessageLoop with methods that are particular to a
-// MessageLoop instantiated with TYPE_UI.
-//
-// This class is typically used like so:
-//   MessageLoopForUI::current()->...call some method...
-//
-class BASE_EXPORT MessageLoopForUI : public MessageLoop {
- public:
-  MessageLoopForUI() : MessageLoop(TYPE_UI) {
-  }
-
-  // Returns the MessageLoopForUI of the current thread.
-  static MessageLoopForUI* current() {
-    MessageLoop* loop = MessageLoop::current();
-    DCHECK(loop);
-    DCHECK_EQ(MessageLoop::TYPE_UI, loop->type());
-    return static_cast<MessageLoopForUI*>(loop);
-  }
-
-  static bool IsCurrent() {
-    MessageLoop* loop = MessageLoop::current();
-    return loop && loop->type() == MessageLoop::TYPE_UI;
-  }
-
-#if defined(OS_IOS)
-  // On iOS, the main message loop cannot be Run().  Instead call Attach(),
-  // which connects this MessageLoop to the UI thread's CFRunLoop and allows
-  // PostTask() to work.
-  void Attach();
-#endif
-
-#if defined(OS_ANDROID)
-  // On Android, the UI message loop is handled by Java side. So Run() should
-  // never be called. Instead use Start(), which will forward all the native UI
-  // events to the Java message loop.
-  void Start();
-#endif
-
-#if defined(USE_OZONE) || (defined(USE_X11) && !defined(USE_GLIB))
-  // Please see MessagePumpLibevent for definition.
-  bool WatchFileDescriptor(
-      int fd,
-      bool persistent,
-      MessagePumpLibevent::Mode mode,
-      MessagePumpLibevent::FileDescriptorWatcher* controller,
-      MessagePumpLibevent::Watcher* delegate);
-#endif
-};
-
-// Do not add any member variables to MessageLoopForUI!  This is important b/c
-// MessageLoopForUI is often allocated via MessageLoop(TYPE_UI).  Any extra
-// data that you need should be stored on the MessageLoop's pump_ instance.
-COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForUI),
-               MessageLoopForUI_should_not_have_extra_member_variables);
-
-#endif  // !defined(OS_NACL)
-
-//-----------------------------------------------------------------------------
-// MessageLoopForIO extends MessageLoop with methods that are particular to a
-// MessageLoop instantiated with TYPE_IO.
-//
-// This class is typically used like so:
-//   MessageLoopForIO::current()->...call some method...
-//
-class BASE_EXPORT MessageLoopForIO : public MessageLoop {
- public:
-  MessageLoopForIO() : MessageLoop(TYPE_IO) {
-  }
-
-  // Returns the MessageLoopForIO of the current thread.
-  static MessageLoopForIO* current() {
-    MessageLoop* loop = MessageLoop::current();
-    DCHECK_EQ(MessageLoop::TYPE_IO, loop->type());
-    return static_cast<MessageLoopForIO*>(loop);
-  }
-
-  static bool IsCurrent() {
-    MessageLoop* loop = MessageLoop::current();
-    return loop && loop->type() == MessageLoop::TYPE_IO;
-  }
-
-#if !defined(OS_NACL_SFI)
-
-#if defined(OS_WIN)
-  typedef MessagePumpForIO::IOHandler IOHandler;
-  typedef MessagePumpForIO::IOContext IOContext;
-  typedef MessagePumpForIO::IOObserver IOObserver;
-#elif defined(OS_IOS)
-  typedef MessagePumpIOSForIO::Watcher Watcher;
-  typedef MessagePumpIOSForIO::FileDescriptorWatcher
-      FileDescriptorWatcher;
-  typedef MessagePumpIOSForIO::IOObserver IOObserver;
-
-  enum Mode {
-    WATCH_READ = MessagePumpIOSForIO::WATCH_READ,
-    WATCH_WRITE = MessagePumpIOSForIO::WATCH_WRITE,
-    WATCH_READ_WRITE = MessagePumpIOSForIO::WATCH_READ_WRITE
-  };
-#elif defined(OS_POSIX)
-  typedef MessagePumpLibevent::Watcher Watcher;
-  typedef MessagePumpLibevent::FileDescriptorWatcher
-      FileDescriptorWatcher;
-  typedef MessagePumpLibevent::IOObserver IOObserver;
-
-  enum Mode {
-    WATCH_READ = MessagePumpLibevent::WATCH_READ,
-    WATCH_WRITE = MessagePumpLibevent::WATCH_WRITE,
-    WATCH_READ_WRITE = MessagePumpLibevent::WATCH_READ_WRITE
-  };
-#endif
-
-  void AddIOObserver(IOObserver* io_observer);
-  void RemoveIOObserver(IOObserver* io_observer);
-
-#if defined(OS_WIN)
-  // Please see MessagePumpWin for definitions of these methods.
-  void RegisterIOHandler(HANDLE file, IOHandler* handler);
-  bool RegisterJobObject(HANDLE job, IOHandler* handler);
-  bool WaitForIOCompletion(DWORD timeout, IOHandler* filter);
-#elif defined(OS_POSIX)
-  // Please see MessagePumpIOSForIO/MessagePumpLibevent for definition.
-  bool WatchFileDescriptor(int fd,
-                           bool persistent,
-                           Mode mode,
-                           FileDescriptorWatcher* controller,
-                           Watcher* delegate);
-#endif  // defined(OS_IOS) || defined(OS_POSIX)
-#endif  // !defined(OS_NACL_SFI)
-};
-
-// Do not add any member variables to MessageLoopForIO!  This is important b/c
-// MessageLoopForIO is often allocated via MessageLoop(TYPE_IO).  Any extra
-// data that you need should be stored on the MessageLoop's pump_ instance.
-COMPILE_ASSERT(sizeof(MessageLoop) == sizeof(MessageLoopForIO),
-               MessageLoopForIO_should_not_have_extra_member_variables);
-
-}  // namespace base
-
-#endif  // BASE_MESSAGE_LOOP_MESSAGE_LOOP_H_