DevTools: Base aggregated tree view percentage on the busy time.

third_party/WebKit/Source/devtools/front_end/timeline/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 572 matching lines @@
 }
 
 .timeline-tree-view .data-grid .background-bar {
     float: right;
     height: 18px;
     background-color: hsla(43, 84%, 64%, 0.2);
     border-bottom: 1px solid hsl(43, 84%, 64%);
 }
 
 .timeline-tree-view .data-grid .selected .background-bar {
-    background-color: rgba(255, 255, 255, 0.25);
-    border-bottom-color: rgba(255, 255, 255, 0.5);
+    background-color: rgba(255, 255, 255, 0.3);
+    border-bottom-color: rgba(255, 255, 255, 0.9);
 }
 
 .timeline-tree-view .timeline-details-view-body .full-widget-dimmed-banner {
     background-color: inherit;
 }
 
 .timeline-details .filter-input-field {
     width: 120px;
 }
 
@@ skipping 58 matching lines @@
 }
 
 .timeline-landing-warning-close {
     float: right;
     margin-top: -10px;
     margin-right: -13px;
 }
 
 .timeline-landing-warning span[is=ui-icon] {
     margin: -8px;
-}
+}