gl_surface_egl: ensure off and on screen surfaces use the same EGLConfig

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h

 // Copyright (c) 2012 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_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_
 
 #include <X11/extensions/shape.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
@@ skipping 217 matching lines @@
   void ConvertEventToDifferentHost(ui::LocatedEvent* located_event,
                                    DesktopWindowTreeHostX11* host);
 
   // Resets the window region for the current widget bounds if necessary.
   void ResetWindowRegion();
 
   // Serializes an image to the format used by _NET_WM_ICON.
   void SerializeImageRepresentation(const gfx::ImageSkiaRep& rep,
                                     std::vector<unsigned long>* data);
 
-  // Returns an 8888 ARGB visual. Can return NULL if there is no matching
-  // visual on this display.
-  Visual* GetARGBVisual();
-
   // See comment for variable open_windows_.
   static std::list<XID>& open_windows();
 
   // Map the window (shows it) taking into account the given |show_state|.
   void MapWindow(ui::WindowShowState show_state);
 
   void SetWindowTransparency();
 
   // Relayout the widget's client and non-client views.
   void Relayout();
@@ skipping 115 matching lines @@
   XID modal_dialog_xid_;
 
   base::WeakPtrFactory<DesktopWindowTreeHostX11> close_widget_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopWindowTreeHostX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_