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

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

Index: chrome/browser/resources/settings/privacy_page/privacy_page.js
diff --git a/chrome/browser/resources/settings/privacy_page/privacy_page.js b/chrome/browser/resources/settings/privacy_page/privacy_page.js
index ebcbff77a4db7b7664a2ef9a02f6c0bdc91a6657..f02f8e1cdfd382491540cab09aaf5f4e1774dd64 100644
--- a/chrome/browser/resources/settings/privacy_page/privacy_page.js
+++ b/chrome/browser/resources/settings/privacy_page/privacy_page.js
@@ -41,9 +41,19 @@ Polymer({
     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);
@@ -101,4 +111,18 @@ Polymer({
     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>
 });