Switch MessagePumpWin to use base::win::MessageWindow

base/message_loop/message_pump_win.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 BASE_MESSAGE_LOOP_MESSAGE_PUMP_WIN_H_
 #define BASE_MESSAGE_LOOP_MESSAGE_PUMP_WIN_H_
 
 #include <windows.h>
 
 #include <list>
 #include <memory>
 
 #include "base/base_export.h"
 #include "base/message_loop/message_pump.h"
 #include "base/time/time.h"
+#include "base/win/message_window.h"
 #include "base/win/scoped_handle.h"
 
 namespace base {
 
 // MessagePumpWin serves as the base for specialized versions of the MessagePump
 // for Windows. It provides basic functionality like handling of observers and
 // controlling the lifetime of the message pump.
 class BASE_EXPORT MessagePumpWin : public MessagePump {
  public:
   MessagePumpWin();
@@ skipping 91 matching lines @@
 class BASE_EXPORT MessagePumpForUI : public MessagePumpWin {
  public:
   MessagePumpForUI();
   ~MessagePumpForUI() override;
 
   // MessagePump methods:
   void ScheduleWork() override;
   void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override;
 
  private:
-  static LRESULT CALLBACK WndProcThunk(HWND window_handle,
-                                       UINT message,
-                                       WPARAM wparam,
-                                       LPARAM lparam);
+  bool MessageCallback(
+      UINT message, WPARAM wparam, LPARAM lparam, LRESULT* result);
   void DoRunLoop() override;
-  void InitMessageWnd();
   void WaitForWork();
   void HandleWorkMessage();
   void HandleTimerMessage();
   void RescheduleTimer();
   bool ProcessNextWindowsMessage();
   bool ProcessMessageHelper(const MSG& msg);
   bool ProcessPumpReplacementMessage();
 
-  // Atom representing the registered window class.
-  ATOM atom_;
-
-  // A hidden message-only window.
-  HWND message_hwnd_;
+  base::win::MessageWindow message_window_;
 };
 
 //-----------------------------------------------------------------------------
 // MessagePumpForGpu is a simplified version of UI message pump that is
 // optimized for the GPU process. Unlike MessagePumpForUI it doesn't have a
 // hidden window and doesn't handle a situation where a native message pump
 // might take over message processing.
 //
 class BASE_EXPORT MessagePumpForGpu : public MessagePumpWin {
  public:
@@ skipping 128 matching lines @@
   // The completion port associated with this thread.
   win::ScopedHandle port_;
   // This list will be empty almost always. It stores IO completions that have
   // not been delivered yet because somebody was doing cleanup.
   std::list<IOItem> completed_io_;
 };
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_LOOP_MESSAGE_PUMP_WIN_H_