DevTools: extract modules (with extensions)

third_party/WebKit/Source/devtools/front_end/perf_ui/pieChart.css

 /*
  * Copyright (c) 2014 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.
  */
 
 .root {
     position: relative;
     width: 100%;
     height: 100%;
 }
 
 .pie-chart-foreground {
     position: absolute;
     width: 100%;
     height: 100%;
     z-index: 10;
     top: 0;
     display: flex;
 }
 
 .pie-chart-total {
     margin: auto;
     padding: 2px 5px;
     background-color: rgba(255, 255, 255, 0.6);
 }