servo: Merge #15419 - Update WR (from glennw:update-wr-lots-of-stuff); r=jdm

Source-Repo: https://github.com/servo/servo
Source-Revision: bf814aa5badfde78b5b530d17fd821a321c40b1a

servo/components/layout_thread/lib.rs

@@ -987,7 +987,8 @@ impl LayoutThread {
                 Some(get_root_flow_background_color(layout_root)),
                 webrender_traits::Epoch(epoch_number),
                 viewport_size,
-                builder);
+                builder,
+                true);
             self.webrender_api.generate_frame();
         });
     }