LibWeb/SVG: Add FEFloodElement

Author: https://github.com/ananas-dev
Commit: d3684a36b0
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5028
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/CSS/ComputedProperties.h

@@ -194,6 +194,8 @@ public:
     float stroke_opacity() const;
     FillRule fill_rule() const;
     ClipRule clip_rule() const;
+    Color flood_color(Layout::NodeWithStyle const&) const;
+    float flood_opacity() const;
 
     Gfx::FontCascadeList const& computed_font_list() const
     {