Web Animations: Add SVGRectInterpolationType

third_party/WebKit/LayoutTests/animations/svg-attribute-interpolation/resources/interpolation-test.js

 /* Copyright 2015 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Exported function:
  *  - assertAttributeInterpolation({property, from, to, [fromComposite], [toComposite], [underlying]}, [{at: fraction, is: value}])
  *        Constructs a test case for each fraction that asserts the expected value
  *        equals the value produced by interpolation between from and to composited
  *        onto underlying by fromComposite and toComposite respectively using
  *        SMIL and Web Animations.
@@ skipping 121 matching lines @@
       elements.push(point.y);
     }
     return String(elements);
   }
 
   function serializeSVGPreserveAspectRatio(preserveAspectRatio) {
     return String([preserveAspectRatio.align, preserveAspectRatio.meetOrSlice]);
   }
 
   function serializeSVGRect(rect) {
-    return String([rect.x, rect.y, rect.width, rect.height]);
+    return [rect.x, rect.y, rect.width, rect.height].join(', ');
   }
 
   function serializeSVGTransformList(transformList) {
     var elements = [];
     for (var index = 0; index < transformList.numberOfItems; ++index) {
       var transform = transformList.getItem(index);
       elements.push(transform.type);
       elements.push(transform.angle);
       elements.push(transform.matrix.a);
       elements.push(transform.matrix.b);
@@ skipping 318 matching lines @@
   }).then(() => {
     var asyncHandle = async_test('This test uses interpolation-test.js.')
     requestAnimationFrame(() => {
       runTests().then(() => asyncHandle.done());
     });
   });
 
   window.assertAttributeInterpolation = assertAttributeInterpolation;
   window.neutralKeyframe = neutralKeyframe;
 })();