gtk: Some code cleanup for the message-pump.

base/message_loop/message_loop.h

 // 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>
 
@@ skipping 22 matching lines @@
 #include "base/message_loop/message_pump_io_ios.h"
 #elif defined(OS_POSIX)
 #include "base/message_loop/message_pump_libevent.h"
 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 
 #if defined(USE_AURA) && defined(USE_X11) && !defined(OS_NACL)
 #include "base/message_loop/message_pump_aurax11.h"
 #elif defined(USE_OZONE) && !defined(OS_NACL)
 #include "base/message_loop/message_pump_ozone.h"
 #else
+#define USE_GTK_MESSAGE_PUMP
 #include "base/message_loop/message_pump_gtk.h"
 #endif
 
 #endif
 #endif
 
 namespace base {
 
 class HistogramBase;
+class MessagePumpDispatcher;
+class MessagePumpObserver;
 class RunLoop;
 class ThreadTaskRunnerHandle;
 #if defined(OS_ANDROID)
 class MessagePumpForUI;
 #endif
 class WaitableEvent;
 
 // A MessageLoop is used to process events for a particular thread.  There is
 // at most one MessageLoop instance per thread.
 //
@@ skipping 21 matching lines @@
 //     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:
 
-#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
+#if defined(USE_GTK_MESSAGE_PUMP)
+  typedef MessagePumpGdkObserver Observer;
+#elif !defined(OS_MACOSX) && !defined(OS_ANDROID)
   typedef MessagePumpDispatcher Dispatcher;
   typedef MessagePumpObserver Observer;
 #endif
 
   // 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.
   //
@@ skipping 608 matching lines @@
 
 // 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_