LibWeb: Respect CSS image-rendering mode when painting canvas elements

If the content wants to be pixelated, we should honor that and paint
with nearest-neighbor scaling. The fact that it's faster is a nice bonus
as well. :^)

Userland/Libraries/LibWeb/Layout/CanvasBox.cpp

@@ -36,8 +36,10 @@ void CanvasBox::paint(PaintContext& context, PaintPhase phase)
         if (!context.viewport_rect().intersects(enclosing_int_rect(absolute_rect())))
             return;
 
-        if (dom_node().bitmap())
-            context.painter().draw_scaled_bitmap(rounded_int_rect(absolute_rect()), *dom_node().bitmap(), dom_node().bitmap()->rect(), 1.0f, Gfx::Painter::ScalingMode::BilinearBlend);
+        if (dom_node().bitmap()) {
+            auto scaling_mode = computed_values().image_rendering() == CSS::ImageRendering::Pixelated ? Gfx::Painter::ScalingMode::NearestNeighbor : Gfx::Painter::ScalingMode::BilinearBlend;
+            context.painter().draw_scaled_bitmap(rounded_int_rect(absolute_rect()), *dom_node().bitmap(), dom_node().bitmap()->rect(), 1.0f, scaling_mode);
+        }
     }
 }