Import CSSWG Shapes tests

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

+function verifyTextPoints(shape, numLines, tolerance, side) {
+    var failed = false;
+    if (tolerance === undefined)
+        tolerance = 0.5;
+    if (side === undefined)
+        side = "left";
+
+    if (side === "right")
+        shape.roundedRect.x = shape.containerWidth - (shape.roundedRect.x + shape.roundedRect.width);
+
+    var expected = getRoundedRectLeftEdge(shape);
+
+    for(var i = 0; i < numLines; i++) {
+       var line = document.getElementById('test'+i);
+       var actual = line.getBoundingClientRect().left;
+       if (side === "right")
+            actual = shape.containerWidth - (actual + line.getBoundingClientRect().width);
+
+        if( Math.abs( (actual - expected[i])) > tolerance ){
+            line.style.setProperty('color', 'red');
+            console.log('diff: ' + Math.abs(actual - expected[i]));
+            failed = true;
+        }
+    }
+    if (window.done) {
+        assert_false(failed, "Lines positioned properly around the shape.");
+        done();
+    }
+}