MD History: hide tooltip promo when drawer is swiped open

chrome/browser/resources/md_history/app.js

Index: chrome/browser/resources/md_history/app.js
diff --git a/chrome/browser/resources/md_history/app.js b/chrome/browser/resources/md_history/app.js
index 730ff7e0f8df5ed2bc22725f490c70eadd30e955..cc519fb367ee8829e3b5346a2db5b47d8686231c 100644
--- a/chrome/browser/resources/md_history/app.js
+++ b/chrome/browser/resources/md_history/app.js
@@ -86,7 +86,16 @@ Polymer({
       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.
@@ -147,6 +156,25 @@ Polymer({
   },
 
   /**
+   * @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