Ozone Demo: Fix NOTREACHED assert when SwapBuffersAsync is not supported

ui/ozone/demo/ozone_demo.cc

Index: ui/ozone/demo/ozone_demo.cc
diff --git a/ui/ozone/demo/ozone_demo.cc b/ui/ozone/demo/ozone_demo.cc
index 7ae189c3c0bb2613e6ae963711aaf124772c5cf3..bbfeff49bb96bd54dcc6a70cba85154ba30a38ab 100644
--- a/ui/ozone/demo/ozone_demo.cc
+++ b/ui/ozone/demo/ozone_demo.cc
@@ -217,6 +217,8 @@ std::unique_ptr<ui::Renderer> RendererFactory::CreateRenderer(
       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);