Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components/polymer/src/standard/events.html

+<!--
+@license
+Copyright (c) 2014 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="../lib/gestures.html">
+
+<script>
+
+  /**
+   * Supports `listeners` and `keyPresses` objects.
+   *
+   * Example:
+   *
+   *     using('Base', function(Base) {
+   *
+   *       Polymer({
+   *
+   *         listeners: {
+   *           // `click` events on the host are delegated to `clickHandler`
+   *           'click': 'clickHandler'
+   *         },
+   *
+   *         keyPresses: {
+   *           // 'ESC' key presses are delegated to `escHandler`
+   *           Base.ESC_KEY: 'escHandler'
+   *         },
+   *
+   *         ...
+   *
+   *       });
+   *
+   *     });
+   *
+   * @class standard feature: events
+   *
+   */
+
+  Polymer.Base._addFeature({
+
+    listeners: {},
+
+    _listenListeners: function(listeners) {
+      var node, name, key;
+      for (key in listeners) {
+        if (key.indexOf('.') < 0) {
+          node = this;
+          name = key;
+        } else {
+          name = key.split('.');
+          node = this.$[name[0]];
+          name = name[1];
+        }
+        this.listen(node, name, listeners[key]);
+      }
+    },
+
+    listen: function(node, eventName, methodName) {
+      var host = this;
+      var handler = function(e) {
+        if (host[methodName]) {
+          host[methodName](e, e.detail);
+        } else {
+          console.warn('[%s].[%s]: event handler [%s] is null in scope (%o)',
+            node.localName, eventName, methodName, host);
+        }
+      };
+      switch (eventName) {
+        case 'tap':
+        case 'track':
+          Polymer.Gestures.add(eventName, node, handler);
+          break;
+
+        default:
+          node.addEventListener(eventName, handler);
+          break;
+      }
+    },
+
+    keyCodes: {
+      ESC_KEY: 27,
+      ENTER_KEY: 13,
+      LEFT: 37,
+      UP: 38,
+      RIGHT: 39,
+      DOWN: 40,
+      SPACE: 32
+    }
+
+  });
+
+</script>