Update different JumpList categories on demand

chrome/browser/win/jumplist.h

Index: chrome/browser/win/jumplist.h
diff --git a/chrome/browser/win/jumplist.h b/chrome/browser/win/jumplist.h
index 0279af26e198153fccf2f13c6de8a501aa8f4cfa..1e72190492e004643a63bcc82d7573b7b944b6ea 100644
--- a/chrome/browser/win/jumplist.h
+++ b/chrome/browser/win/jumplist.h
@@ -176,6 +176,14 @@ class JumpList : public sessions::TabRestoreServiceObserver,
   // The directory which contains JumpList icons.
   base::FilePath icon_dir_;
 
+  // A boolean flag indicating if "Most Visited" category of the JumpList should
+  // be updated or not.
+  bool should_update_most_visited_;
+
+  // A boolean flag indicating if "Recently Closed" category of the JumpList
+  // should be updated or not.
+  bool should_update_recent_closed_;
+
   // Timer for requesting delayed updates of the jumplist.
   base::OneShotTimer timer_;
 
@@ -186,11 +194,12 @@ class JumpList : public sessions::TabRestoreServiceObserver,
   // comes in before it finishes.
   base::CancelableTaskTracker::TaskId task_id_;
 
-  // A task runner running tasks to update the jumplist in JumpListIcons.
-  scoped_refptr<base::SingleThreadTaskRunner> update_jumplisticons_task_runner_;
+  // A task runner running tasks to update the JumpList.
+  scoped_refptr<base::SingleThreadTaskRunner> update_jumplist_task_runner_;
 
-  // A task runner running tasks to delete JumpListIconsOld directory.
-  scoped_refptr<base::SequencedTaskRunner> delete_jumplisticonsold_task_runner_;
+  // A task runner running tasks to delete JumpListIcons directory and
+  // JumpListIconsOld directory.
+  scoped_refptr<base::SequencedTaskRunner> delete_jumplisticons_task_runner_;
 
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<JumpList> weak_ptr_factory_;