Sync Promo: Add a way to collapse the sync promo

chrome/browser/resources/new_tab_sync_promo.js

Index: chrome/browser/resources/new_tab_sync_promo.js
===================================================================
--- chrome/browser/resources/new_tab_sync_promo.js	(revision 93571)
+++ chrome/browser/resources/new_tab_sync_promo.js	(working copy)
@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 cr.define('new_tab', function() {
-
   /**
    * NewTabSyncPromo class
    * Subclass of options.SyncSetupOverlay that customizes the sync setup
@@ -21,18 +20,67 @@
   NewTabSyncPromo.prototype = {
     __proto__: options.SyncSetupOverlay.prototype,
 
+    // Variable to track if the promo is expanded or collapsed.
+    isSyncPromoExpanded_: false,
+
     showOverlay_: function() {
-      $('sync-setup-overlay').hidden = false;
+      this.expandSyncPromo_(true);
     },
 
+    // Initializes the page.
     initializePage: function() {
       options.SyncSetupOverlay.prototype.initializePage.call(this);
-      chrome.send('SyncSetupAttachHandler');
+      var self = this;
+      $('sync-promo-toggle-button').onclick = function() {
+        self.onTogglePromo();
+      }
+      chrome.send('InitializeSyncPromo');
     },
 
-    showOverlay_: function() {
-      $('sync-setup-overlay').hidden = false;
+    // Handler for the toggle button to show or hide the sync promo.
+    onTogglePromo: function() {
+      if (this.isSyncPromoExpanded_) {
+        this.expandSyncPromo_(false);
+        chrome.send('CollapseSyncPromo');
+      } else {
+        chrome.send('ExpandSyncPromo');
+      }
     },
+
+    // Shows or hides the sync promo.
+    expandSyncPromo_: function(shouldExpand) {
+      this.isSyncPromoExpanded_ = shouldExpand;
+      if (shouldExpand) {
+        $('sync-promo-login-status').hidden = true;
+        $('sync-setup-overlay').hidden = false;
+        $('sync-promo').classList.remove('collapsed');
+      } else {
+        $('sync-promo-login-status').hidden = false;
+        $('sync-setup-overlay').hidden = true;
+        $('sync-promo').classList.add('collapsed');
+      }
+      layoutSections();
+    },
+
+    // Sets the sync login name. If there's no login name then makes the
+    // 'not connected' UI visible and shows the sync promo toggle button.
+    updateLogin_: function(user_name) {
+      if (user_name) {
+        $('sync-promo-toggle').hidden = true;
+        $('sync-promo-user-name').textContent = user_name;
+        $('sync-promo-not-connected').hidden = true;
+      } else {
+        $('sync-promo-toggle').hidden = false;
+        $('sync-promo-user-name').hidden = true;
+        $('sync-promo-not-connected').hidden = false;
+      }
+      layoutSections();
+    },
+
+    // Shows the sync promo.
+    showSyncPromo_: function() {
+      $('sync-promo').hidden = false;
+    },
   };
 
   NewTabSyncPromo.showErrorUI = function() {
@@ -63,6 +111,14 @@
     NewTabSyncPromo.getInstance().initializePage();
   }
 
+  NewTabSyncPromo.showSyncPromo = function() {
+    NewTabSyncPromo.getInstance().showSyncPromo_();
+  }
+
+  NewTabSyncPromo.updateLogin = function(user_name) {
+    NewTabSyncPromo.getInstance().updateLogin_(user_name);
+  }
+
   // Export
   return {
     NewTabSyncPromo : NewTabSyncPromo