[cc-frame-viewer] Show layers and levels of detail

tools/cc-frame-viewer/src/lthi_view.css

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 x-lthi-view {
     display: block;
     -webkit-flex-direction: column;
 }
 
 x-lthi-view > x-lthi-view-options {
     display: inline-span;
     margins: 0 auto 0 auto;
+    border-bottom: 1px solid rgba(0,0,0,.25);
 }
 
-x-lthi-view > x-lthi-view-options > span:not(:nth-child(1)) {
+x-lthi-view > x-lthi-view-options > span:not(:nth-child(1)),
+x-lthi-view > x-lthi-view-options > label:not(:nth-child(1)) {
     margin-left: 16px;
 }
 
 x-lthi-view > x-lthi-view-options > span {
     margin-right: 8px;
 }
 
 
-x-lthi-view > x-trees {
+x-lthi-view > x-quad-views {
     display: -webkit-flex;
     -webkit-flex-direction: row;
 }
 
-x-lthi-view > x-trees > *:not(:first-child) {
+x-lthi-view > x-quad-views > *:not(:first-child) {
     margin-left: 16px;
 }