WebUI TaskManager: Supports background-page mode.

chrome/browser/resources/task_manager/task_manager.css

 /*
  * Copyright (c) 2011 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.
  */
 
 * {
   margin: 0;
   padding: 0;
 }
@@ skipping 71 matching lines @@
 /* Bullets on the left of row. */
 .table-row > .table-row-cell:first-child:before {
   -webkit-border-radius: 3px;
   background: #CCCCCC;
   margin: 7px 4px 7px 7px;
   width: 6px;
   content: "";
   display: block;
 }
 
+.table-background-row {
+  background-color: hsl(34, 91%, 87%);
+  border-color: hsl(34, 91%, 65%);
+  background-image: -webkit-linear-gradient(rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0));

[xiyuan, 2011/08/11 17:14:13]

nit: 80 col?

+}
+
 /* Cells in table. */
 .table-row-cell {
   display: -webkit-box;
   -webkit-box-orient: horizontal;
 }
 
 /* Containers of titles of tasks on the process. */
 .detail-container-title {
   -webkit-box-flex: 1;
   display: -webkit-box;
@@ skipping 41 matching lines @@
 /* Container for the ok/cancel buttons. */
 .footer-right-container {
   -webkit-box-flex: 1;
   text-align: right;
 }
 
 button {
   padding: 1px 6px;
   margin: 2px;
 }