[Alignment] Single class for holding the alignment data.

Source/core/css/CSSProperties.in

Index: Source/core/css/CSSProperties.in
diff --git a/Source/core/css/CSSProperties.in b/Source/core/css/CSSProperties.in
index 810c1a62c66e43aac8ac7bf620236d9f3280331c..e32ee1ea57231066b6b995b1ce5f46445268cd66 100644
--- a/Source/core/css/CSSProperties.in
+++ b/Source/core/css/CSSProperties.in
@@ -99,10 +99,10 @@ font-weight animatable, inherited, font, type_name=FontWeight, name_for_methods=
 text-rendering inherited, font, type_name=TextRenderingMode
 zoom custom_all
 
-align-content custom_all
-align-items custom_all
+align-content initial=initialContentAlignment, converter=convertContentAlignmentData
+align-items initial=initialSelfAlignment, converter=convertSelfOrDefaultAlignmentData
 alignment-baseline svg
-align-self custom_all
+align-self initial=initialSelfAlignment, converter=convertSelfOrDefaultAlignmentData
 backface-visibility
 background-attachment custom_all
 background-blend-mode custom_all
@@ -187,9 +187,9 @@ grid-template-rows runtime_flag=CSSGridLayout, custom_all
 height animatable, initial=initialSize, converter=convertLengthSizing
 image-rendering inherited
 isolation runtime_flag=CSSCompositing
-justify-content custom_all
-justify-items runtime_flag=CSSGridLayout, custom_all
-justify-self runtime_flag=CSSGridLayout, custom_all
+justify-content initial=initialContentAlignment, converter=convertContentAlignmentData
+justify-items runtime_flag=CSSGridLayout, initial=initialSelfAlignment, converter=convertSelfOrDefaultAlignmentData
+justify-self runtime_flag=CSSGridLayout, initial=initialSelfAlignment, converter=convertSelfOrDefaultAlignmentData
 left animatable, initial=initialOffset, converter=convertLengthOrAuto
 letter-spacing animatable, inherited, initial=initialLetterWordSpacing, converter=convertSpacing
 lighting-color animatable, svg, converter=convertSVGColor