Timeline: add layer tree outline to layer details view

Source/devtools/front_end/timelinePanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * 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
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 726 matching lines @@
     left: 0px;
     color: #777;
     background-color: rgba(255, 255, 255, 0.8);
     font-size: 30px;
     z-index: 500;
     display: flex;
     justify-content: center;
     align-items: center;
 }
 
+.layer-tree.outline-disclosure {
+    z-index: 10;
+}
+
+.layer-tree.outline-disclosure > ol,
+.profiler-log-view > ol {
+    margin-left: -12px;
+}
+
+.layer-tree.outline-disclosure ol.children,
+.profiler-log-view ol.children {
+    padding-left: 12px;
+}
+
+.layer-tree.outline-disclosure li,
+.profiler-log-view li {
+    margin-top: 0;
+    margin-bottom: 0;
+    padding: 1 1 1 14px;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
+.timeline-paint-profiler-view .outline-disclosure ol.children {
+    padding-left: 12px;
+}
+
+.layer-tree.outline-disclosure .dimmed {
+    opacity: 0.6;
+}
+
 .layers-3d-view {
     overflow: hidden;
     -webkit-user-select: none;
 }
 
 .layers-3d-view canvas {
     flex: 1 1;
 }
 
 .transform-control-panel .status-bar-item > .glyph {
@@ skipping 78 matching lines @@
 }
 
 .profiler-log-view .console-formatted-string {
     white-space: nowrap;
 }
 
 .profiler-log-view.section .properties {
     display: block;
 }
 
-.timeline-paint-profiler-view .outline-disclosure li {
-    margin-top: 0;
-    margin-bottom: 0;
-    padding: 1px 1px 1px 14px;
-    white-space: nowrap;
-    overflow: hidden;
-    text-overflow: ellipsis;
-}
-
-.timeline-paint-profiler-view .outline-disclosure ol.children {
-    padding-left: 12px;
-}
-
 .paint-profiler-image-view {
     overflow: hidden;
 }
 
 .paint-profiler-image-view img {
     border: solid 1px black;
     -webkit-transform-origin: 0px 0px;
 }