Add Signin_Impression_FromSettings user action for Desktops

BUG=639860
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2339723002
Cr-Commit-Position: refs/heads/master@{#419270}

chrome/browser/resources/options/browser_options.js

@@ -214,6 +214,10 @@ cr.define('options', function() {
       // Sync (Sign in) section.
       this.updateSyncState_(/** @type {options.SyncStatus} */(
           loadTimeData.getValue('syncData')));
+      if (!$('sync-overview').hidden) {
+        chrome.send('metricsHandler:recordAction',
+                    ['Signin_Impression_FromSettings']);
+      }
 
       $('start-stop-sync').onclick = function(event) {
         if (self.signedIn_) {

chrome/browser/resources/settings/people_page/people_page.js

@@ -184,6 +184,9 @@ Polymer({
    * @private
    */
   handleSyncStatus_: function(syncStatus) {
+    if (!this.syncStatus && syncStatus && !syncStatus.signedIn) {
+      chrome.metricsPrivate.recordUserAction('Signin_Impression_FromSettings');
+    }
     this.syncStatus = syncStatus;
   },