MD History: hide tooltip promo when drawer is swiped open

ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.js

Index: ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.js
diff --git a/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.js b/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.js
index d69e634e6efad675b2df266494ae744f1951f205..502c4b7f1c60bdd070b72bb4de73702bde8e445d 100644
--- a/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.js
+++ b/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.js
@@ -35,7 +35,7 @@ Polymer({
     // Whether to show menu promo tooltip.
     showMenuPromo: {
       type: Boolean,
-      value: false,
+      notify: true,

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

Is it necessary to remove the value: false here? Can history-app set the
loadTimeData value in its ready() instead?

It's weird to require clients to set a value on showMenuPromo for the title to
render.

     },
 
     closeMenuPromo: String,
@@ -70,7 +70,6 @@ Polymer({
   /** @private */
   onMenuTap_: function() {
     this.fire('cr-menu-tap');
-    this.onClosePromoTap_();
   },
 
   /** @private */