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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 Maps JavaScript API, firing the `api-load` event when ready.
+
+#### Example
+
+    <google-maps-api api-key="abc123" version="3.exp"></google-maps-api>
+    <script>
+      var mapsAPI = document.querySelector('google-maps-api');
+      mapsAPI.addEventListener('api-load', function(e) {
+        // this.api === google.maps
+      });
+    </script>
+
+Any number of components can use `<google-maps-api>` elements, and the library will only be loaded once.
+
+@summary Element wrapper around Google Maps API.
+-->
+<script>
+  Polymer({
+
+    is: 'google-maps-api',
+
+    behaviors: [
+      Polymer.IronJsonpLibraryBehavior
+    ],
+
+    properties: {
+
+      /** @private */
+      mapsUrl: {
+        type: String,
+        value: 'https://maps.googleapis.com/maps/api/js?callback=%%callback%%'
+      },
+
+      /**
+       * A Maps API key. To obtain an API key, see developers.google.com/maps/documentation/javascript/tutorial#api_key.
+       */
+      apiKey: {
+        type: String,
+        value: ''
+      },
+
+      /**
+       * A Maps API for Business Client ID. To obtain a Maps API for Business Client ID, see developers.google.com/maps/documentation/business/.
+       * If set, a Client ID will take precedence over an API Key.
+       */
+      clientId: {
+        type: String,
+        value: ''
+      },
+
+      /**
+       * Version of the Maps API to use.
+       */
+      version: {
+        type: String,
+        value: '3.exp'
+      },
+
+      /**
+       * The localized language to load the Maps API with. For more information
+       * see https://developers.google.com/maps/documentation/javascript/basics#Language
+       *
+       * Note: the Maps API defaults to the preffered language setting of the browser.
+       * Use this parameter to override that behavior.
+       */
+      language: {
+        type: String,
+        value: ''
+      },
+      /**
+       * If true, sign-in is enabled.
+       * See https://developers.google.com/maps/documentation/javascript/signedin#enable_sign_in
+       */
+      signedIn: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
+       * Fired when the Maps API library is loaded and ready.
+       * @event api-load
+       */
+      /**
+       * Name of event fired when library is loaded and available.
+       */
+      notifyEvent: {
+        type: String,
+        value: 'api-load'
+      },
+
+      /** @private */
+      libraryUrl: {
+        type: String,
+        computed: '_computeUrl(mapsUrl, version, apiKey, clientId, language, signedIn)'
+      }
+    },
+
+    _computeUrl: function(mapsUrl, version, apiKey, clientId, language, signedIn) {
+      var url = mapsUrl + '&v=' + version;
+
+      // Always load all Maps API libraries.
+      url += '&libraries=drawing,geometry,places,visualization';
+
+      if (apiKey && !clientId) {
+        url += '&key=' + apiKey;
+      }
+
+      if (clientId) {
+        url += '&client=' + clientId;
+      }
+
+      // Log a warning if the user is not using an API Key or Client ID.
+      if (!apiKey && !clientId) {
+        var warning = 'No Google Maps API Key or Client ID specified. ' +
+            'See https://developers.google.com/maps/documentation/javascript/get-api-key ' +
+            'for instructions to get started with a key or client id.';
+        console.warn(warning);
+      }
+
+      if (language) {
+        url += '&language=' + language;
+      }
+
+      if (signedIn) {
+        url += '&signed_in=' + signedIn;
+      }
+      return url;
+    },
+
+    /**
+     * Provides the google.maps JS API namespace.
+     */
+    get api() {
+      return google.maps;
+    }
+  });
+</script>