Add a message pump for touchui=1

base/message_pump_glib.h

 // Copyright (c) 2008 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_PUMP_GLIB_H_
 #define BASE_MESSAGE_PUMP_GLIB_H_
 #pragma once
 
 #include "base/message_pump.h"
 #include "base/observer_list.h"
@@ skipping 39 matching lines @@
     // normal. If false is returned, the nested loop exits immediately.
     virtual bool Dispatch(GdkEvent* event) = 0;
   };
 
   MessagePumpForUI();
   virtual ~MessagePumpForUI();
 
   // Like MessagePump::Run, but GdkEvent objects are routed through dispatcher.
   virtual void RunWithDispatcher(Delegate* delegate, Dispatcher* dispatcher);
 
+  // Run a single iteration of the mainloop. A return value of true indicates
+  // that an event was handled. |block| indicates if it should wait if no event
+  // is ready for processing.
+  virtual bool RunOnce(GMainContext* context, bool block);
+
   virtual void Run(Delegate* delegate) { RunWithDispatcher(delegate, NULL); }
   virtual void Quit();
   virtual void ScheduleWork();
   virtual void ScheduleDelayedWork(const Time& delayed_work_time);
 
   // Internal methods used for processing the pump callbacks.  They are
   // public for simplicity but should not be used directly.  HandlePrepare
   // is called during the prepare step of glib, and returns a timeout that
   // will be passed to the poll. HandleCheck is called after the poll
   // has completed, and returns whether or not HandleDispatch should be called.
   // HandleDispatch is called if HandleCheck returned true.
   int HandlePrepare();
   bool HandleCheck();
   void HandleDispatch();
 
   // Adds an Observer, which will start receiving notifications immediately.
   void AddObserver(Observer* observer);
 
   // Removes an Observer.  It is safe to call this method while an Observer is
   // receiving a notification callback.
   void RemoveObserver(Observer* observer);
 
+  // Dispatch an available GdkEvent. Essentially this allows a subclass to do
+  // some task before/after calling the default handler (EventDispatcher).
+  virtual void DispatchEvents(GdkEvent* event);
+
  private:
   // We may make recursive calls to Run, so we save state that needs to be
   // separate between them in this structure type.
   struct RunState;
 
   // Invoked from EventDispatcher. Notifies all observers we're about to
   // process an event.
   void WillProcessEvent(GdkEvent* event);
 
   // Invoked from EventDispatcher. Notifies all observers we processed an
@@ skipping 28 matching lines @@
 
   // List of observers.
   ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePumpForUI);
 };
 
 }  // namespace base
 
 #endif  // BASE_MESSAGE_PUMP_GLIB_H_