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+<!--
+Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at https://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at https://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at https://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 https://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+<link rel="import" href="../iron-jsonp-library/iron-jsonp-library.html">
+
+<!--
+Dynamically loads the Google+ JavaScript API, firing the `api-load` event when ready.
+
+Any number of components can use `<google-plusone-api>` elements, and the library will only be loaded once.
+-->
+<script>
+  Polymer({
+
+    is: 'google-plusone-api',
+
+    behaviors: [
+      Polymer.IronJsonpLibraryBehavior
+    ],
+
+    properties: {
+
+      /** @private */
+      libraryUrl:  {
+        type: String,
+        value: 'https://apis.google.com/js/plusone.js?onload=%%callback%%'
+      },
+
+      /**
+       * Fired when the API library is loaded and available.
+       * @event js-api-load
+       */
+      /**
+       * Name of event fired when library is loaded and available.
+       */
+      notifyEvent:  {
+        type: String,
+        value: 'api-load'
+      }
+
+    },
+
+    get api() {
+      return gapi;
+    }
+
+  });
+</script>