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 46a0321536da91f73d74cc9d3b51fd08029050d8..f275fc4923ef77a3272fdf6a2858e77109ad47b7 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1356,6 +1356,10 @@ 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";