LibWeb: Support individual scale CSS property

Author: https://github.com/awesomekling
Commit: 9a7c9286c4
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2506
Reviewed-by: https://github.com/shannonbooth

Libraries/LibWeb/CSS/CSSStyleValue.h

@@ -125,6 +125,7 @@ public:
         Rect,
         Resolution,
         Rotation,
+        Scale,
         ScrollbarGutter,
         Shadow,
         Shorthand,
@@ -295,6 +296,10 @@ public:
     RotationStyleValue const& as_rotation() const;
     RotationStyleValue& as_rotation() { return const_cast<RotationStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_rotation()); }
 
+    bool is_scale() const { return type() == Type::Scale; }
+    ScaleStyleValue const& as_scale() const;
+    ScaleStyleValue& as_scale() { return const_cast<ScaleStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_scale()); }
+
     bool is_scrollbar_gutter() const { return type() == Type::ScrollbarGutter; }
     ScrollbarGutterStyleValue const& as_scrollbar_gutter() const;
     ScrollbarGutterStyleValue& as_scrollbar_gutter() { return const_cast<ScrollbarGutterStyleValue&>(const_cast<CSSStyleValue const&>(*this).as_scrollbar_gutter()); }