Pull web-animations-js into third-party via the third_party/polymer/reproduce.sh script. Add necess…

third_party/web-animations-js/sources/src/property-names.js

Index: third_party/web-animations-js/sources/src/property-names.js
diff --git a/third_party/web-animations-js/sources/src/property-names.js b/third_party/web-animations-js/sources/src/property-names.js
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index 0000000000000000000000000000000000000000..c52d990cdb0f56e1b4e9fc01b8167fbcd18d552d
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+++ b/third_party/web-animations-js/sources/src/property-names.js
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+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+//     You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//     See the License for the specific language governing permissions and
+// limitations under the License.
+
+(function(scope, testing) {
+
+  var aliased = {};
+
+  function alias(name, aliases) {
+    aliases.concat([name]).forEach(function(candidate) {
+      if (candidate in document.documentElement.style) {
+        aliased[name] = candidate;
+      }
+    });
+  }
+  alias('transform', ['webkitTransform', 'msTransform']);
+  alias('transformOrigin', ['webkitTransformOrigin']);
+  alias('perspective', ['webkitPerspective']);
+  alias('perspectiveOrigin', ['webkitPerspectiveOrigin']);
+
+  scope.propertyName = function(property) {
+    return aliased[property] || property;
+  };
+
+})(webAnimations1, webAnimationsTesting);