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 1f65fd2968f6f1ae7a113dce121380b020f3f6c2..4bbcbb62b41758890fd2057763897d40213a6d45 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1352,6 +1352,10 @@ 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";