Update bower.json for Polymer elements and add PRESUBMIT.py

third_party/polymer/v1_0/components/neon-animation/neon-shared-element-animatable-behavior.html

 <!--
 @license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
 The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
 Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 -->
 
 <link rel="import" href="../polymer/polymer.html">
 <link rel="import" href="neon-animatable-behavior.html">
 
 <script>
 
   /**
    * Use `Polymer.NeonSharedElementAnimatableBehavior` to implement elements containing shared element
    * animations.
-   * @polymerBehavior
+   * @polymerBehavior Polymer.NeonSharedElementAnimatableBehavior
    */
-  Polymer.NeonSharedElementAnimatableBehavior = [Polymer.NeonAnimatableBehavior, {
+  Polymer.NeonSharedElementAnimatableBehaviorImpl = {
 
     properties: {
 
       /**
        * A map of shared element id to node.
        */
       sharedElements: {
         type: Object,
         value: {}
       }
 
     }
 
-  }];
+  };
+
+  /** @polymerBehavior Polymer.NeonSharedElementAnimatableBehavior */
+  Polymer.NeonSharedElementAnimatableBehavior = [
+    Polymer.NeonAnimatableBehavior,
+    Polymer.NeonSharedElementAnimatableBehaviorImpl
+  ];
 
 </script>