LibWeb: Support SVG gradient spread method in Skia painter

Progress on Tests/LibWeb/Ref/svg-gradient-spreadMethod.html

Userland/Libraries/LibWeb/Painting/DisplayListPlayerSkia.cpp

@@ -786,6 +786,20 @@ CommandResult DisplayListPlayerSkia::fill_path_using_color(FillPathUsingColor co
     return CommandResult::Continue;
 }
 
+SkTileMode to_skia_tile_mode(SVGLinearGradientPaintStyle::SpreadMethod spread_method)
+{
+    switch (spread_method) {
+    case SVGLinearGradientPaintStyle::SpreadMethod::Pad:
+        return SkTileMode::kClamp;
+    case SVGLinearGradientPaintStyle::SpreadMethod::Reflect:
+        return SkTileMode::kMirror;
+    case SVGLinearGradientPaintStyle::SpreadMethod::Repeat:
+        return SkTileMode::kRepeat;
+    default:
+        VERIFY_NOT_REACHED();
+    }
+}
+
 SkPaint paint_style_to_skia_paint(Painting::SVGGradientPaintStyle const& paint_style, Gfx::FloatRect bounding_rect)
 {
     SkPaint paint;
@@ -816,7 +830,7 @@ SkPaint paint_style_to_skia_paint(Painting::SVGGradientPaintStyle const& paint_s
             positions.append(color_stop.position);
         }
 
-        auto shader = SkGradientShader::MakeLinear(points.data(), colors.data(), positions.data(), color_stops.size(), SkTileMode::kClamp, 0, &matrix);
+        auto shader = SkGradientShader::MakeLinear(points.data(), colors.data(), positions.data(), color_stops.size(), to_skia_tile_mode(paint_style.spread_method()), 0, &matrix);
         paint.setShader(shader);
     } else if (is<SVGRadialGradientPaintStyle>(paint_style)) {
         // TODO: