Task Manager Should remember the most recently enabled columns.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 9d21f958f0fa622a09711e80b9d3baea6b95d84c..08903efaf02c3e88c9d83ff06bf74ce65b019248 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1357,6 +1357,10 @@ const char kBrowserWindowPlacementPopup[] = "browser.window_placement_popup";
 // manager window to restore on startup.
 const char kTaskManagerWindowPlacement[] = "task_manager.window_placement";
 
+// The most recent stored column visibility of the task manager table to be
+// restored on startup.
+const char kTaskManagerColumnVisibility[] = "task_manager.column_visibility";
+
 // A collection of position, size, and other data relating to app windows to
 // restore on startup.
 const char kAppWindowPlacement[] = "browser.app_window_placement";