Pass repeating gradients to webrender.

components/layout/webrender_helpers.rs

@@ -370,10 +370,15 @@ impl WebRenderDisplayItemConverter for DisplayItem {
                 let start_point = item.gradient.start_point.to_pointf();
                 let end_point = item.gradient.end_point.to_pointf();
                 let clip = item.base.clip.to_clip_region(builder);
+                let extend_mode = if item.gradient.repeating {
+                    ExtendMode::Repeat
+                } else {
+                    ExtendMode::Clamp
+                };
                 let gradient = builder.create_gradient(start_point,
                                                        end_point,
                                                        item.gradient.stops.clone(),
-                                                       ExtendMode::Clamp);
+                                                       extend_mode);
                 builder.push_gradient(rect,
                                       clip,
                                       gradient,
@@ -385,10 +390,15 @@ impl WebRenderDisplayItemConverter for DisplayItem {
                 let center = item.gradient.center.to_pointf();
                 let radius = item.gradient.radius.to_sizef();
                 let clip = item.base.clip.to_clip_region(builder);
+                let extend_mode = if item.gradient.repeating {
+                    ExtendMode::Repeat
+                } else {
+                    ExtendMode::Clamp
+                };
                 let gradient = builder.create_radial_gradient(center,
                                                               radius,
                                                               item.gradient.stops.clone(),
-                                                              ExtendMode::Clamp);
+                                                              extend_mode);
                 builder.push_radial_gradient(rect,
                                              clip,
                                              gradient,