WebUI TaskManager: Supports background-page mode.

chrome/browser/resources/task_manager/task_manager.css

Index: chrome/browser/resources/task_manager/task_manager.css
diff --git a/chrome/browser/resources/task_manager/task_manager.css b/chrome/browser/resources/task_manager/task_manager.css
index 0c823e52bbbc2f9f13ac8bcdaa397c03e2face48..cd73aeebf92dea860a5bcbfead59ba3ad74871f1 100644
--- a/chrome/browser/resources/task_manager/task_manager.css
+++ b/chrome/browser/resources/task_manager/task_manager.css
@@ -89,6 +89,12 @@ body {
   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;