Milo: Pending swarming builds

appengine/cmd/milo/frontend/static/buildbot/css/default.css

 /* Copyright 2015 The LUCI Authors. All rights reserved.
  * Use of this source code is governed under the Apache License, Version 2.0
  * that can be found in the LICENSE file.
  */
 
 body.interface {
   margin-left: 30px;
   margin-right: 30px;
   margin-top: 20px;
   margin-bottom: 50px;
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   background-color: #fd3;
   border-color: #C5C56D;
 }
 
 .paused {
   color: #FFFFFF;
   background-color: #8080FF;
   border-color: #dddddd;
 }
 
-.offline,td.offline {
+.offline,td.offline,.pending{
   color: #FFFFFF;
   background-color: #777777;
   border-color: #dddddd;
 }
 
 
 .start {
   border-bottom-left-radius: 10px;
   -webkit-border-bottom-left-radius: 10px;
   -moz-border-radius-bottomleft: 10px;
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   display: list-item;
 }
 
 form.command_forcebuild .force-any .force-text {
   display: inline;
 }
 
 div.step-text:first-child {
     display: inline;
 }