Ozone Demo: Fix NOTREACHED assert when SwapBuffersAsync is not supported

ui/ozone/demo/ozone_demo.cc

 // 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.
 
 #include <utility>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 199 matching lines @@
 }
 
 std::unique_ptr<ui::Renderer> RendererFactory::CreateRenderer(
     gfx::AcceleratedWidget widget,
     const gfx::Size& size) {
   switch (type_) {
     case GL: {
       scoped_refptr<gl::GLSurface> surface = CreateGLSurface(widget);
       if (!surface)
         LOG(FATAL) << "Failed to create GL surface";
+      if (!surface->SupportsAsyncSwap())
+        LOG(FATAL) << "GL surface must support SwapBuffersAsync";
       if (surface->IsSurfaceless())
         return base::MakeUnique<ui::SurfacelessGlRenderer>(widget, surface,
                                                            size);
       else
         return base::MakeUnique<ui::GlRenderer>(widget, surface, size);
     }
     case SOFTWARE:
       return base::MakeUnique<ui::SoftwareRenderer>(widget, size);
   }
 
@@ skipping 107 matching lines @@
       ->SetCurrentLayoutByName("us");
 
   base::RunLoop run_loop;
 
   WindowManager window_manager(run_loop.QuitClosure());
 
   run_loop.Run();
 
   return 0;
 }