DevTools: add entry points for command menu

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 27 matching lines @@
     overflow: auto;
     flex: auto;
     display: flex;
     flex-direction: column;
 }
 
 .tabbed-pane-content.has-no-tabs {
     background-color: lightgray;
 }
 
-.tabbed-pane-placeholder {
-    font-size: 14px;
-    text-align: center;
-    margin-top: 20px;
-    text-shadow: rgba(255, 255, 255, 0.75) 0 1px 0;
-}
-
 .tabbed-pane-header {
     display: flex;
     flex: 0 0 27px;
     border-bottom: 1px solid #ccc;
     overflow: visible;
     width: 100%;
     background-color: #f3f3f3;
 }
 
 .tabbed-pane-header-contents {
@@ skipping 202 matching lines @@
 
 .tabbed-pane-left-toolbar {
     margin-right: -4px;
     flex: none;
 }
 
 .tabbed-pane-right-toolbar {
     margin-left: -4px;
     flex: none;
 }