DevTools: Navigate TabbedPane with arrow keys

third_party/WebKit/Source/devtools/front_end/ui/tabbedPane.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 78 matching lines @@
     border-bottom: none;
     line-height: 15px;
     white-space: nowrap;
     cursor: default;
     display: flex;
     align-items: center;
     color: #5a5a5a;
 }
 
 .tabbed-pane-header-tab:hover,
-.tabbed-pane-header-tab.selected:hover {
+.tabbed-pane-header-tab.selected:hover,
+.tabbed-pane-header-tab[data-keyboard-focus="true"]:focus {
     color: #333;
     background-color: #e5e5e5;
 }
 
 .tabbed-pane-header-tab-title {
     text-overflow: ellipsis;
     overflow: hidden;
 }
 
 .tabbed-pane-header-tab.measuring {
@@ skipping 157 matching lines @@
 
 .tabbed-pane-left-toolbar {
     margin-right: -4px;
     flex: none;
 }
 
 .tabbed-pane-right-toolbar {
     margin-left: -4px;
     flex: none;
 }