trace-viewer/trace_viewer/core/tracks/process_track_base.css

/* Copyright (c) 2013 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.
 */

.process-track-header {
  -webkit-flex: 0 0 auto;
  background-image: -webkit-gradient(linear,
                                     0 0, 100% 0,
                                     from(#E5E5E5),
                                     to(#D1D1D1));
  border-bottom: 1px solid #8e8e8e;
  border-top: 1px solid white;
  font-size: 75%;
}

.process-track-name:before {
  content: '\25B8'; /* Right triangle */
  padding: 0 5px;
}

.process-track-base.expanded .process-track-name:before {
  content: '\25BE'; /* Down triangle */
}