MD History: hide tooltip promo when drawer is swiped open

chrome/browser/resources/md_history/app.html

Index: chrome/browser/resources/md_history/app.html
diff --git a/chrome/browser/resources/md_history/app.html b/chrome/browser/resources/md_history/app.html
index f6a3538678cc677c61dce4972f8487d674ebad8c..98d793f26c031ebcedfd7a41dea56b0c453d25ae 100644
--- a/chrome/browser/resources/md_history/app.html
+++ b/chrome/browser/resources/md_history/app.html
@@ -21,10 +21,12 @@
         display: block;
         height: 100%;
         overflow: hidden;
+        z-index: 0;
       }
 
       history-toolbar {
         background: var(--md-toolbar-color);
+        z-index: 2;
       }
 
       /* Sizing this with flex causes slow load performance, see
@@ -32,6 +34,7 @@
       #main-container {
         height: calc(100% - var(--toolbar-height));
         position: relative;
+        z-index: 1;
       }
 
       :host([grouped_]) #main-container {
@@ -55,6 +58,10 @@
         display: none;
       }
 
+      #drawer {
+        z-index: 3;
+      }
+
       #drawer-header {
         align-items: center;
         border-bottom: 1px solid rgba(0, 0, 0, 0.08);
@@ -99,7 +106,8 @@
         query-start-time="[[queryResult_.info.queryStartTime]]"
         query-end-time="[[queryResult_.info.queryEndTime]]"
         has-drawer="[[hasDrawer_]]"
-        show-sync-notice="[[showSyncNotice_(hasSyncedResults, selectedPage_)]]">
+        show-sync-notice="[[showSyncNotice_(hasSyncedResults, selectedPage_)]]"
+        show-menu-promo="[[showMenuPromo_]]">
     </history-toolbar>
 
     <div id="main-container">