LibWeb: Add AbstractImageStyleValue::natural_aspect_ratio()

Author: https://github.com/MacDue
Commit: d2c96e213f
Pull-request: https://github.com/SerenityOS/serenity/pull/22508
Issue: https://github.com/SerenityOS/serenity/issues/20992
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/nico

Userland/Libraries/LibWeb/CSS/StyleValues/ImageStyleValue.cpp

@@ -124,6 +124,13 @@ Optional<CSSPixels> ImageStyleValue::natural_height() const
     return {};
 }
 
+Optional<CSSPixelFraction> ImageStyleValue::natural_aspect_ratio() const
+{
+    if (auto image_data = this->image_data())
+        return image_data->intrinsic_aspect_ratio();
+    return {};
+}
+
 void ImageStyleValue::paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering image_rendering) const
 {
     if (auto const* b = bitmap(m_current_frame_index, dest_rect.size().to_type<int>()); b != nullptr) {