Import CSSWG Shapes tests

LayoutTests/imported/csswg-test/css-shapes-1/shape-outside/supported-shapes/support/subpixel-utils.js

 var SubPixelLayout = (function() {
     var enabled = undefined;
 
     function isEnabled()
     {
         if (enabled === undefined) {
             var elem = document.createElement('div');
             elem.style.setProperty('width', '4.5px');
             document.body.appendChild(elem);
             var bounds = elem.getBoundingClientRect();
             enabled = (bounds.width != Math.floor(bounds.width));
             document.body.removeChild(elem);
         }
         return enabled;
     }
 
     return {
         isEnabled: isEnabled,
         snapToLayoutUnit: function(f) {
             return isEnabled() ? Math.floor(f * 64) / 64 : Math.floor(f); // as in LayoutUnit(f).toFloat()
         },
-        ceilToLayoutUnit: function(f) {
+        ceilSnapToLayoutUnit: function(f) {
             return isEnabled() ? Math.ceil(f * 64) / 64 : Math.ceil(f); // see ceiledLayoutUnit(), LayoutUnit.h
-        },
-        resolution: function() {
-            return isEnabled() ? 1/64 : 1;
         }
     }
 }());