DevTools: extract a component for layer viewer

third_party/WebKit/Source/devtools/front_end/layer_viewer/layerDetailsView.css

+/*
+ * Copyright 2016 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.
+ */
+
+table td {
+    padding-left: 8px;
+}
+
+table td:first-child {
+    font-weight: bold;
+}
+
+.scroll-rect.active {
+    background-color: rgba(100, 100, 100, 0.2);
+}
+
+ul {
+    list-style: none;
+    -webkit-padding-start: 0;
+    -webkit-margin-before: 0;
+    -webkit-margin-after: 0;
+}
+
+a {
+    padding: 8px;
+    display: block;
+}