DevTools: Focus background in Toolbars

third_party/WebKit/Source/devtools/front_end/ui/toolbar.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 {
     flex: none;
     padding: 0 2px;
 }
@@ skipping 251 matching lines @@
     position: absolute;
     background-color: #5a5a5a;
     top: 0;
     left:  0;
 }
 
 .toolbar-button.emulate-active {
     background-color: rgb(163, 163, 163);
 }
 
+:host-context(.keyboard-focus) .toolbar-button:focus::after,

[pfeldman, 2017/03/28 17:48:04]

host-context is for theming only, that's rather something that should be solved
using inspectorCommon.css

+:host-context(.keyboard-focus) .focused:not(.toolbar-input)::after{
+    position:absolute;
+    top: 2px;
+    bottom: 2px;
+    left: 2px;
+    right: 2px;
+    background-color: rgba(0, 0, 0, 0.08);
+    border-radius: 2px;
+    content: "";
+}
+
+:host-context(.keyboard-focus) .focused:not(.toolbar-input)::after{
+    left: 0px;
+    right: -2px;
+}
+
 .toolbar-shadow.floating {
     flex-direction: column;
     height: auto;
     background-color: white;
     border: 1px solid #ccc;
     margin-top: -1px;
     width: 28px;
     left: -2px;
 }
 
 span.toolbar-select-container.toolbar-item.warning {
     background: #ffd7d7;
     padding: 0 5px 0 0;
     margin-right: 1px;
 }