MD History: hide tooltip promo when drawer is swiped open

chrome/browser/resources/md_history/app.js

 // Copyright 2016 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.
 
 cr.define('md_history', function() {
   var lazyLoadPromise = null;
   function ensureLazyLoaded() {
     if (!lazyLoadPromise) {
       lazyLoadPromise = new Promise(function(resolve, reject) {
         Polymer.Base.importHref(
@@ skipping 68 matching lines @@
       type: Boolean,
       // Updated on synced-device-manager attach by chrome.sending
       // 'otherDevicesInitialized'.
       value: loadTimeData.getBoolean('isUserSignedIn'),
     },
 
     toolbarShadow_: {
       type: Boolean,
       reflectToAttribute: true,
       notify: true,
-    }
+    },
+
+    showMenuPromo_: {
+      type: Boolean,
+      value: function() {
+        return loadTimeData.getBoolean('showMenuPromo');
+      },
+      notify: true,

[calamity, 2016/10/27 02:12:41]

Does this need notify: true?

+      observer: 'showMenuPromoChanged_',
+    },
   },
 
   // TODO(calamity): Replace these event listeners with data bound properties.
   listeners: {
     'cr-menu-tap': 'onMenuTap_',
     'history-checkbox-select': 'checkboxSelected',
     'unselect-all': 'unselectAll',
     'delete-selected': 'deleteSelected',
     'history-close-drawer': 'closeDrawer_',
     'history-view-changed': 'historyViewChanged_',
@@ skipping 40 matching lines @@
   },
 
   /** @private */
   onMenuTap_: function() {
     var drawer = this.$$('#drawer');
     if (drawer)
       drawer.toggle();
   },
 
   /**
+   * @param {!CustomEvent} e
+   * @private
+   */
+  onOpenedChanged_: function(e) {
+    if (e.detail.value)
+      this.showMenuPromo_ = false;
+  },
+
+  /**
+   * @param {boolean} showMenuPromo
+   * @param {boolean|undefined} oldShowMenuPromo
+   * @private
+   */
+  showMenuPromoChanged_: function(showMenuPromo, oldShowMenuPromo) {
+    if (!showMenuPromo && oldShowMenuPromo)
+      md_history.BrowserService.getInstance().menuPromoShown();
+  },
+
+  /**
    * Listens for history-item being selected or deselected (through checkbox)
    * and changes the view of the top toolbar.
    * @param {{detail: {countAddition: number}}} e
    */
   checkboxSelected: function(e) {
     var toolbar = /** @type {HistoryToolbarElement} */ (this.$.toolbar);
     toolbar.count = /** @type {HistoryListContainerElement} */ (this.$.history)
                         .getSelectedItemCount();
   },
 
@@ skipping 190 matching lines @@
             break;
         }
         break;
     }
 
     md_history.BrowserService.getInstance().recordHistogram(
       'History.HistoryPageView', histogramValue, HistoryPageViewHistogram.END
     );
   },
 });