Import CSSWG Shapes tests

LayoutTests/imported/csswg-test/css-shapes-1/shape-outside/supported-shapes/support/rounded-rectangle.js

 function ellipseXIntercept(yi, rx, ry)
 {
     return rx * Math.sqrt(1 - (yi * yi) / (ry * ry));
 }
 
 function scanConvertRoundedRectangleOutside(r, height, lineHeight, corner)
 {
     var intervals = [];
     var upperCorner = true;
     var lowerCorner = true;
@@ skipping 17 matching lines @@
             var dx = ellipseXIntercept(y - (r.y + r.height - r.ry), r.rx, r.ry);
             intervals.push( { y: y, left: r.x + r.rx - dx, right: r.x + r.width - r.rx + dx} );
         }
         else // within the rectangle's vertical edges
             intervals.push( {y: y, left: r.x, right: r.x + r.width} );
     }
 
     return intervals;
 }
 
-function genLeftRightRoundedRectFloatShapeOutsideRefTest(args)
-{
-    genLeftRoundedRectFloatShapeOutsideRefTest(args);
-    genRightRoundedRectFloatShapeOutsideRefTest(args);
-}
-
 function genLeftRoundedRectFloatShapeOutsideRefTest(args)
 {
     var leftRoundedRect = args.roundedRect;
     var leftRoundedRectIntervals = scanConvertRoundedRectangleOutside(leftRoundedRect, args.containerHeight, args.lineHeight, args.corner);
     var leftFloatDivs = leftRoundedRectIntervals.map(function(interval) {
         var width = SubPixelLayout.snapToLayoutUnit(interval.right);
         var cls = "left-" + args.floatElementClassSuffix;
         return '<div class="' + cls + '" style="width:' + width + 'px"></div>';
     });
     document.getElementById("left-" + args.insertElementIdSuffix).insertAdjacentHTML('afterend', leftFloatDivs.join("\n"));
+    return leftFloatDivs;
+}
+
+function getRoundedRectLeftEdge(args)
+{
+    var leftRoundedRect = args.roundedRect;
+    var leftRoundedRectIntervals = scanConvertRoundedRectangleOutside(leftRoundedRect, args.containerHeight, args.lineHeight, args.corner);
+    var leftSidePoints = leftRoundedRectIntervals.map(function(interval) {
+        var width = SubPixelLayout.snapToLayoutUnit(interval.right);
+        return width;
+    });
+    return leftSidePoints;
 }
 
 function genRightRoundedRectFloatShapeOutsideRefTest(args)
 {
     var rightRoundedRect = Object.create(args.roundedRect);
     rightRoundedRect.x = args.containerWidth - args.roundedRect.width;
     var rightRoundedRectIntervals = scanConvertRoundedRectangleOutside(rightRoundedRect, args.containerHeight, args.lineHeight, args.corner);
     var rightFloatDivs = rightRoundedRectIntervals.map(function(interval) {
         var width = args.containerWidth - SubPixelLayout.snapToLayoutUnit(interval.left);
         var cls = "right-" + args.floatElementClassSuffix;
         return '<div class="' + cls + '" style="width:' + width + 'px"></div>';
     });
     document.getElementById("right-" + args.insertElementIdSuffix).insertAdjacentHTML('afterend', rightFloatDivs.join("\n"));
-}
+}