Moving the contents of chrome://gpu Profiling to chrome://tracing.

chrome/browser/resources/tracing/tracing_controller.css

 /*
 Copyright (c) 2011 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.
 */
-.gpu-tracing-overlay {
+.tracing-overlay {
   text-align: center;
   display: -webkit-box;
   width: 200px;
   height: 80px;
   -webkit-box-orient: vertical;
   -webkit-box-pack: center;
   -webkit-box-align: center;
 }
 
-.gpu-tracing-start-button {
+.tracing-start-button {
   position: fixed;
   right: 3px;
   top: -1px;
   -webkit-margin-start: 5px;
   text-decoration: none;
   text-align: center;
   display: inline-block;
   margin-top: 4px;
   padding: 5px 10px 3px 10px;
   border-top-right-radius: 8px;
   border-top-left-radius: 8px;
   background-clip: border-box;
   background: rgb(255, 0, 0);
   border: 1px solid black;
   border-bottom: 0;
 }