Don't run Web Animations interpolation tests for prefixed properties

LayoutTests/animations/interpolation/resources/interpolation-test.js

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 61 matching lines @@
   var fragment = document.createDocumentFragment();
   var fragmentAttachedListeners = [];
   var style = document.createElement('style');
   var cssTests = document.createElement('div');
   cssTests.id = 'css-tests';
   cssTests.textContent = 'CSS Animations:';
   var afterTestCallback = null;
   fragment.appendChild(style);
   fragment.appendChild(cssTests);
 
-  if (webAnimationsTest) {
-    var waTests = document.createElement('div');
-    waTests.id = 'web-animations-tests';
-    waTests.textContent = 'Web Animations API:';
-    fragment.appendChild(waTests);
+  var waTestsDiv = null;
+  function waTests() {
+    if (!waTestsDiv) {
+      waTestsDiv = document.createElement('div');
+      waTestsDiv.id = 'web-animations-tests';
+      waTestsDiv.textContent = 'Web Animations API:';
+      fragment.appendChild(waTestsDiv);
+    }
+    return waTestsDiv;
   }
 
   var updateScheduled = false;
   function maybeScheduleUpdate() {
     if (updateScheduled) {
       return;
     }
     updateScheduled = true;
     setTimeout(function() {
       updateScheduled = false;
@@ skipping 16 matching lines @@
       var cssResultString = 'CSS Animations:\n';
       var waResultString = 'Web Animations API:\n';
       for (var i = 0; i < targets.length; i++) {
         if (targets[i].testType === 'css') {
           cssResultString += targets[i].getResultString() + '\n';
         } else {
           waResultString += targets[i].getResultString() + '\n';
         }
       }
       var results = document.createElement('pre');
-      results.textContent = cssResultString + (webAnimationsTest ? '\n' + waResultString : '');
+      results.textContent = cssResultString + (waTestsDiv ? '\n' + waResultString : '');
       results.id = 'results';
       document.body.appendChild(results);
     }
   }
 
   function convertToReference() {
     console.assert(isRefTest);
     var scripts = document.querySelectorAll('script');
     for (var i = 0; i < scripts.length; i++) {
       scripts[i].parentNode.removeChild(scripts[i]);
@@ skipping 60 matching lines @@
 
   function describeWATest(params) {
     return 'element.animate() ' + convertPropertyToCamelCase(params.property) + ': from [' + params.from + '] to [' + params.to + ']';
   }
 
   function assertInterpolation(params, expectations) {
     var testId = defineKeyframes(params);
     var nextCaseId = 0;
     var cssTestContainer = createTestContainer(describeCSSTest(params), testId);
     cssTests.appendChild(cssTestContainer);
-    if (webAnimationsTest) {
-      var waTestContainer = createTestContainer(describeWATest(params), testId);
-      waTests.appendChild(waTestContainer);
-    }
     expectations.forEach(function(expectation) {
       cssTestContainer.appendChild(makeInterpolationTest(
           'css', expectation.at, testId, 'case-' + ++nextCaseId, params, expectation.is));
     });
-    if (webAnimationsTest) {
+    // We don't support prefixed properties in Web Animations
+    if (webAnimationsTest && params.property[0] != '-') {
+      var waTestContainer = createTestContainer(describeWATest(params), testId);
+      waTests().appendChild(waTestContainer);
       expectations.forEach(function(expectation) {
         waTestContainer.appendChild(makeInterpolationTest(
             'web-animations', expectation.at, testId, 'case-' + ++nextCaseId, params, expectation.is));
       });
     }
     maybeScheduleUpdate();
   }
 
   var nextKeyframeId = 0;
   function defineKeyframes(params) {
@@ skipping 185 matching lines @@
   if (!window.testRunner) {
     setTimeout(function() {
       if (finished) {
         return;
       }
       finishTest();
     }, 10000);
   }
 
   function disableWebAnimationsTest() {
-    if (webAnimationsTest) {
-      fragment.querySelector('#web-animations-tests').remove();
-      webAnimationsTest = false;
-    }
+    webAnimationsTest = false;
   }
 
   window.runAsRefTest = runAsRefTest;
   window.testInterpolationAt = testInterpolationAt;
   window.assertInterpolation = assertInterpolation;
   window.convertToReference = convertToReference;
   window.afterTest = afterTest;
   window.disableWebAnimationsTest = disableWebAnimationsTest;
 })();