Refactor the glib message-pump, and use it as the base for a gtk message pump and an X message pump.

chrome/browser/chromeos/xinput_hierarchy_changed_event_listener.h

 // Copyright (c) 2011 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 CHROME_BROWSER_CHROMEOS_XINPUT_HIERARCHY_CHANGED_EVENT_LISTENER_H_
 #define CHROME_BROWSER_CHROMEOS_XINPUT_HIERARCHY_CHANGED_EVENT_LISTENER_H_
 #pragma once
 
 // TODO(yusukes): Remove the #if once the ARM bot (crbug.com/84694) is fixed.
 #if defined(HAVE_XINPUT2)
@@ skipping 18 matching lines @@
   void Stop();
 
  private:
   // Defines the delete on exit Singleton traits we like.  Best to have this
   // and const/dest private as recommended for Singletons.
   friend struct DefaultSingletonTraits<XInputHierarchyChangedEventListener>;
 
   XInputHierarchyChangedEventListener();
   virtual ~XInputHierarchyChangedEventListener();
 
+#if defined(TOUCH_UI)
+  // MessageLoopForUI::Observer overrides.
+  virtual EventStatus WillProcessXEvent(XEvent* xevent) OVERRIDE;
+#else
   // When TOUCH_UI is not defined, WillProcessXEvent() will not be called
   // automatically. We have to call the function manually by adding the Gdk
   // event filter.
   static GdkFilterReturn GdkEventFilter(GdkXEvent* gxevent,
                                         GdkEvent* gevent,
                                         gpointer data);
 
   // MessageLoopForUI::Observer overrides.
   virtual void WillProcessEvent(GdkEvent* event) OVERRIDE {}
   virtual void DidProcessEvent(GdkEvent* event) OVERRIDE {}
-  virtual bool WillProcessXEvent(XEvent* xevent)
-#if defined(TOUCH_UI)
-    OVERRIDE
 #endif
-    ;
+
+  // Returns true if the event was processed, false otherwise.
+  virtual bool ProcessedXEvent(XEvent* xevent);
 
   bool stopped_;
   int xiopcode_;
 
   DISALLOW_COPY_AND_ASSIGN(XInputHierarchyChangedEventListener);
 };
 
 }  // namespace chromeos
 
 #endif
 #endif  // CHROME_BROWSER_CHROMEOS_XINPUT_HIERARCHY_CHANGED_EVENT_LISTENER_H_