x11: Move X event handling out of the message-pump.

ui/events/platform/platform_event_source.h

 // Copyright 2014 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 UI_EVENTS_PLATFORM_PLATFORM_EVENT_SOURCE_H_
 #define UI_EVENTS_PLATFORM_PLATFORM_EVENT_SOURCE_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 29 matching lines @@
   // The returned |ScopedEventDispatcher| object is a handler for the overridden
   // dispatcher. When this handler is destroyed, it removes the overridden
   // dispatcher, and restores the previous override-dispatcher (or NULL if there
   // wasn't any).
   scoped_ptr<ScopedEventDispatcher> OverrideDispatcher(
       PlatformEventDispatcher* dispatcher);
 
   void AddPlatformEventObserver(PlatformEventObserver* observer);
   void RemovePlatformEventObserver(PlatformEventObserver* observer);
 
+  static scoped_ptr<PlatformEventSource> CreateDefault();
+
  protected:
   PlatformEventSource();
 
   // Dispatches |platform_event| to the dispatchers. If there is an override
   // dispatcher installed using |OverrideDispatcher()|, then that dispatcher
   // receives the event first. |POST_DISPATCH_QUIT_LOOP| flag is set in the
   // returned value if the event-source should stop dispatching events at the
   // current message-loop iteration.
   virtual uint32_t DispatchEvent(PlatformEvent platform_event);
 
@@ skipping 19 matching lines @@
   bool overridden_dispatcher_restored_;
 
   ObserverList<PlatformEventObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformEventSource);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_PLATFORM_PLATFORM_EVENT_SOURCE_H_