MD History: Preload bold Roboto font

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 0b287d535ae590723fb2e1f9422bfe80010d7e95..7f36d58d6d4bebdbe35d70c9d20b998cd21dd404 100644
--- a/chrome/browser/resources/md_history/app.js
+++ b/chrome/browser/resources/md_history/app.js
@@ -147,7 +147,11 @@ Polymer({
     }
 
     // Lazily load the remainder of the UI.
-    md_history.ensureLazyLoaded();
+    md_history.ensureLazyLoaded().then(function() {
+      window.requestIdleCallback(function() {
+        document.fonts.load('bold 12px Roboto');
+      });
+    });
   },
 
   /** Overridden from IronScrollTargetBehavior */