npm_modules: Fork bower_components into Polymer 0.4.0 and 0.5.0 versions

polymer_0.5.0/bower_components/web-animations-js/src/visibility-handler.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) {
+
+  function merge(left, right) {
+    if (left != 'visible' && right != 'visible') return;
+    return [0, 1, function(x) {
+      if (x <= 0) return left;
+      if (x >= 1) return right;
+      return 'visible';
+    }];
+  }
+
+  scope.addPropertiesHandler(String, merge, ['visibility']);
+
+})(webAnimationsMinifill);
+