[Polymer10] Convert base-chart.html to Polymer 1.0

dashboard/dashboard/elements/base-chart.html

Index: dashboard/dashboard/elements/base-chart.html
diff --git a/dashboard/dashboard/elements/base-chart.html b/dashboard/dashboard/elements/base-chart.html
index 50281e29fd6d336ef24a49a87d6b856dea6aea7d..f3fd5371062b20cf3cb78eb1180888bbc2a0cecf 100644
--- a/dashboard/dashboard/elements/base-chart.html
+++ b/dashboard/dashboard/elements/base-chart.html
@@ -5,10 +5,23 @@ Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
-<polymer-element name="base-chart" attributes="chartTitle units flotData">
+<dom-module id="base-chart">
   <script>
     'use strict';
-    Polymer('base-chart', {
+    Polymer({
+
+      is: 'base-chart',
+      properties: {
+        chartTitle: { notify: true },
+
+        flotData: {
+          notify: true,
+          observer: 'flotDataChanged'
+        },
+
+        units: { notify: true }
+      },
+
       getChartOptions: function() {
         return {};
       },
@@ -90,4 +103,4 @@ found in the LICENSE file.
       }
     });
   </script>
-</polymer-element>
+</dom-module>