Ability to display an error in the toolbar state

www/common/toolbar3.js

@@ -691,6 +691,7 @@ define([
     var typing = -1;
     var kickSpinner = function (toolbar, config/*, local*/) {
         if (!toolbar.spinner) { return; }
+        if (toolbar.isErrorState) { return; }
         var $spin = toolbar.spinner;
 
         if (typing === -1) {
@@ -1050,6 +1051,17 @@ define([
             }
         };
 
+        toolbar.errorState = function (state, error) {
+            toolbar.isErrorState = state;
+            if (toolbar.spinner) {
+                if (!state) {
+                    return void kickSpinner(toolbar, config);
+                }
+                var txt = Messages._getKey('errorState', [error]);
+                toolbar.spinner.text(txt);
+            }
+        };
+
         // When the pad is moved to the trash (forget button)
         toolbar.forgotten = function (/*userId*/) {
             toolbar.connected = false;