[svg2] Make 'x' and 'y' presentation attributes

Source/core/css/CSSProperties.in

 // This file specifies all the CSS properties we support and the necessary
 // information for our code generation. The various supported arguments
 // are described below with example usage
 
 
 // - alias_for=other-property
 // Properties specifying alias_for do not get their own enum and instead map
 // directly onto the CSSPropertyID they alias. Currently this means that the
 // UseCounter will not pick up on these (crbug.com/304855)
 
@@ skipping 264 matching lines @@
 text-underline-position runtime_flag=CSS3TextDecorations, inherited, type_name=TextUnderlinePosition
 top animatable, initial=initialOffset, converter=convertLengthOrAuto
 touch-action converter=convertFlags<TouchAction>
 transform animatable, custom_value
 transform-origin animatable, converter=convertTransformOrigin
 transform-style name_for_methods=TransformStyle3D
 unicode-bidi
 vector-effect svg
 vertical-align animatable, custom_inherit, custom_value
 visibility animatable, inherited
+x animatable, svg, converter=convertLengthUnzoomed
+y animatable, svg, converter=convertLengthUnzoomed
 -webkit-animation-delay custom_all
 -webkit-animation-direction custom_all
 -webkit-animation-duration custom_all
 -webkit-animation-fill-mode custom_all
 -webkit-animation-iteration-count custom_all
 -webkit-animation-name custom_all
 -webkit-animation-play-state custom_all
 -webkit-animation-timing-function custom_all
 -webkit-appearance type_name=ControlPart
 -webkit-app-region custom_all
@@ skipping 224 matching lines @@
 -webkit-flex-flow alias_for=flex-flow
 -webkit-flex-grow alias_for=flex-grow
 -webkit-flex-shrink alias_for=flex-shrink
 -webkit-flex-wrap alias_for=flex-wrap
 -webkit-justify-content alias_for=justify-content
 -webkit-opacity alias_for=opacity
 -webkit-order alias_for=order
 -webkit-shape-image-threshold alias_for=shape-image-threshold
 -webkit-shape-margin alias_for=shape-margin
 -webkit-shape-outside alias_for=shape-outside