DevTools: Added styling to focused checkboxes

third_party/WebKit/Source/devtools/front_end/ui/checkboxTextLabel.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.
  */
 
 :host {
     padding: 0;
     margin: 0;
     display: inline-flex;
     flex-shrink: 0;
     align-items: center !important;
 }
 
 input {
     height: 12px;
     width: 12px;
     flex-shrink: 0;
 }
 
+input.dt-checkbox-focus-visible:focus {
+    outline: auto 5px -webkit-focus-ring-color;
+}
+
 input.dt-checkbox-themed {
     -webkit-appearance: none;
     margin: 0 5px auto 2px;
     border: 1px solid rgb(45, 45, 45);
     border-radius: 3px;
     background-color: rgb(102, 102, 102);
     position: relative;
     top: 1px;
 }
 
@@ skipping 24 matching lines @@
 
 } /* media */
 
 ::content .dt-checkbox-text {
     margin-left: 3px;
 }
 
 ::content .dt-checkbox-subtitle {
     color: gray;
 }