DevTools: introduce View: a named widget with the toolbar.

third_party/WebKit/Source/devtools/front_end/accessibility/accessibilityNode.css

 /*
  * Copyright 2015 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.
  */
 
 .ax-computed-text {
     background-image: url(Images/speech.png);
     background-repeat: no-repeat;
     background-position: 0px center;
@@ skipping 37 matching lines @@
 span.ax-internal-role {
     font-style: italic;
 }
 
 .ax-ignored-info {
     padding: 6px;
 }
 
 .ax-ignored-node-pane {
     background-color: hsl(0, 0%, 96%);
+    flex: none;
 }
 
 .tree-outline li {
     padding-left: 1px;
     align-items: baseline;
 }
 
 .tree-outline li.property {
     color: rgb(33, 33, 33);
 }
@@ skipping 29 matching lines @@
     margin-left: -11px;
 }
 
 .ax-value-string {
     color: rgb(200, 0, 0);
 }
 
 .sidebar-pane-stack .sidebar-pane {
     padding-left: 4px;
 }