Implement GLX for Ozone X11.

ui/events/platform/x11/x11_event_source_libevent.h

 // Copyright 2016 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_X11_X11_EVENT_SOURCE_LIBEVENT_H_
 #define UI_EVENTS_PLATFORM_X11_X11_EVENT_SOURCE_LIBEVENT_H_
 
 #include "base/macros.h"
 #include "base/message_loop/message_pump_libevent.h"
 #include "ui/events/events_export.h"
@@ skipping 21 matching lines @@
 // XEventDispatchers is maintained. Uses Libevent to be notified for incoming
 // XEvents.
 class EVENTS_EXPORT X11EventSourceLibevent
     : public X11EventSourceDelegate,
       public PlatformEventSource,
       public base::MessagePumpLibevent::Watcher {
  public:
   explicit X11EventSourceLibevent(XDisplay* display);
   ~X11EventSourceLibevent() override;
 
+  static X11EventSourceLibevent* GetInstance();
+
   // Adds a XEvent dispatcher to the XEvent dispatcher list.
   void AddXEventDispatcher(XEventDispatcher* dispatcher);
 
   // Removes a XEvent dispatcher fERrom the XEvent dispatcher list.
   void RemoveXEventDispatcher(XEventDispatcher* dispatcher);
 
   // X11EventSourceDelegate:
   void ProcessXEvent(XEvent* xevent) override;
 
  private:
@@ skipping 18 matching lines @@
 
   base::MessagePumpLibevent::FileDescriptorWatcher watcher_controller_;
   bool initialized_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(X11EventSourceLibevent);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_PLATFORM_X11_X11_EVENT_SOURCE_LIBEVENT_H_