[MD settings] inform users that the spelling service sends data to google

chrome/browser/resources/settings/privacy_page/privacy_page.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * 'settings-privacy-page' is the settings page containing privacy and
  * security settings.
  */
 Polymer({
@@ skipping 23 matching lines @@
 
 <if expr="_google_chrome and not chromeos">
     /** @type {MetricsReporting} */
     metricsReporting_: Object,
 </if>
 
     /** @private */
     showClearBrowsingDataDialog_: Boolean,
   },
 
+<if expr="_google_chrome">
+  observers: [
+    'updateSpellingService_(prefs.spellcheck.use_spelling_service.value)',
+  ],
+</if>
+
   ready: function() {
     this.ContentSettingsTypes = settings.ContentSettingsTypes;
 
+<if expr="_google_chrome">
+    this.updateSpellingService_();
+</if>
+
 <if expr="_google_chrome and not chromeos">
     var boundSetMetricsReporting = this.setMetricsReporting_.bind(this);
     this.addWebUIListener('metrics-reporting-change', boundSetMetricsReporting);
 
     var browserProxy = settings.PrivacyPageBrowserProxyImpl.getInstance();
     browserProxy.getMetricsReporting().then(boundSetMetricsReporting);
 </if>
   },
 
   /** @protected */
@@ skipping 37 matching lines @@
   },
 
   /**
    * @param {!MetricsReporting} metricsReporting
    * @private
    */
   setMetricsReporting_: function(metricsReporting) {
     this.metricsReporting_ = metricsReporting;
   },
 </if>
+
+<if expr="_google_chrome">
+  /** @private */
+  updateSpellingService_: function() {
+    this.$.spellingServiceToggleButton.checked =
+        this.get('prefs.spellcheck.use_spelling_service.value');
+  },
+
+  /** @private */
+  onUseSpellingServiceTap_: function() {
+    this.set('prefs.spellcheck.use_spelling_service.value',
+        this.$.spellingServiceToggleButton.checked);
+  },
+</if>
 });