Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/iron-media-query/iron-media-query-extracted.js

+
+
+  Polymer({
+
+    is: 'iron-media-query',
+
+    properties: {
+
+      /**
+       * The Boolean return value of the media query.
+       *
+       * @attribute queryMatches
+       * @type Boolean
+       * @default false
+       */
+      queryMatches: {
+        type: Boolean,
+        value: false,
+        readOnly: true,
+        notify: true
+      },
+
+      /**
+       * The CSS media query to evaluate.
+       *
+       * @attribute query
+       * @type String
+       */
+      query: {
+        type: String,
+        observer: 'queryChanged'
+      }
+
+    },
+
+    created: function() {
+      this._mqHandler = this.queryHandler.bind(this);
+    },
+
+    queryChanged: function(query) {
+      if (this._mq) {
+        this._mq.removeListener(this._mqHandler);
+      }
+      if (query[0] !== '(') {
+        query = '(' + query + ')';
+      }
+      this._mq = window.matchMedia(query);
+      this._mq.addListener(this._mqHandler);
+      this.queryHandler(this._mq);
+    },
+
+    queryHandler: function(mq) {
+      this._setQueryMatches(mq.matches);
+    }
+
+  });
+