Fix Polymer licensing issues

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

-// 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 propertyHandlers = {};
-
-  function addPropertyHandler(parser, merger, property) {
-    propertyHandlers[property] = propertyHandlers[property] || [];
-    propertyHandlers[property].push([parser, merger]);
-  }
-  function addPropertiesHandler(parser, merger, properties) {
-    for (var i = 0; i < properties.length; i++) {
-      var property = properties[i];
-      WEB_ANIMATIONS_TESTING && console.assert(property.toLowerCase() === property);
-      addPropertyHandler(parser, merger, property);
-      if (/-/.test(property)) {
-        // Add camel cased variant.
-        addPropertyHandler(parser, merger, property.replace(/-(.)/g, function(_, c) {
-          return c.toUpperCase();
-        }));
-      }
-    }
-  }
-  scope.addPropertiesHandler = addPropertiesHandler;
-
-  function propertyInterpolation(property, left, right) {
-    var handlers = left == right ? [] : propertyHandlers[property];
-    for (var i = 0; handlers && i < handlers.length; i++) {
-      var parsedLeft = handlers[i][0](left);
-      var parsedRight = handlers[i][0](right);
-      if (parsedLeft !== undefined && parsedRight !== undefined) {
-        var interpolationArgs = handlers[i][1](parsedLeft, parsedRight);
-        if (interpolationArgs) {
-          var interp = scope.Interpolation.apply(null, interpolationArgs);
-          return function(t) {
-            if (t == 0) return left;
-            if (t == 1) return right;
-            return interp(t);
-          };
-        }
-      }
-    }
-    return scope.Interpolation(false, true, function(bool) {
-      return bool ? right : left;
-    });
-  }
-  scope.propertyInterpolation = propertyInterpolation;
-
-})(webAnimations1, webAnimationsTesting);
-