MD Bookmarks: Show toolbar overlay when multiple items are selected

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 09ddc81da27e90bc73cedc0573ca8fd3e471e3ba..dff9bc22d500a8d1d32e539fd997868e26b43ef2 100644
--- a/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.js
+++ b/ui/webui/resources/cr_elements/cr_toolbar/cr_toolbar.js
@@ -35,10 +35,15 @@ Polymer({
       value: false,
     },
 
-    closeMenuPromo: String,
+    // True when the toolbar is displaying in narrow mode.
+    narrow: {
+      type: Boolean,
+      reflectToAttribute: true,
+      readonly: true,
+      notify: true,
+    },
 
-    /** @private */
-    narrow_: {type: Boolean, reflectToAttribute: true},
+    closeMenuPromo: String,
 
     /** @private */
     showingSearch_: {