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+<!--
+@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-animation-behavior.html">
+
+<script>
+
+  /**
+   * Use `Polymer.NeonSharedElementAnimationBehavior` to implement shared element animations.
+   * @polymerBehavior Polymer.NeonSharedElementAnimationBehavior
+   */
+  Polymer.NeonSharedElementAnimationBehaviorImpl = {
+
+    properties: {
+
+      /**
+       * Cached copy of shared elements.
+       */
+      sharedElements: {
+        type: Object
+      }
+
+    },
+
+    /**
+     * Finds shared elements based on `config`.
+     */
+    findSharedElements: function(config) {
+      var fromPage = config.fromPage;
+      var toPage = config.toPage;
+      if (!fromPage || !toPage) {
+        console.warn(this.is + ':', !fromPage ? 'fromPage' : 'toPage', 'is undefined!');
+        return null;
+      };
+
+      if (!fromPage.sharedElements || !toPage.sharedElements) {
+        console.warn(this.is + ':', 'sharedElements are undefined for', !fromPage.sharedElements ? fromPage : toPage);
+        return null;
+      };
+
+      var from = fromPage.sharedElements[config.id]
+      var to = toPage.sharedElements[config.id];
+
+      if (!from || !to) {
+        console.warn(this.is + ':', 'sharedElement with id', config.id, 'not found in', !from ? fromPage : toPage);
+        return null;
+      }
+
+      this.sharedElements = {
+        from: from,
+        to: to
+      };
+      return this.sharedElements;
+    }
+
+  };
+
+  /** @polymerBehavior Polymer.NeonSharedElementAnimationBehavior */
+  Polymer.NeonSharedElementAnimationBehavior = [
+    Polymer.NeonAnimationBehavior,
+    Polymer.NeonSharedElementAnimationBehaviorImpl
+  ];
+
+</script>