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..ee87d41a7368f78b8454fbb10d78f047195f4eb1 100644
--- a/chrome/browser/win/jumplist.h
+++ b/chrome/browser/win/jumplist.h
@@ -115,15 +115,16 @@ class JumpList : public sessions::TabRestoreServiceObserver,
   explicit JumpList(Profile* profile);  // Use JumpListFactory instead
   ~JumpList() override;
 
-  // Creates a ShellLinkItem object from a tab (or a window) and add it to the
-  // given list.
   // These functions are copied from the RecentlyClosedTabsHandler class for
   // compatibility with the new-tab page.
+  // AddTab creates a ShellLinkItem object from a tab and add it to |data|.
   bool AddTab(const sessions::TabRestoreService::Tab& tab,
-              ShellLinkItemList* list,
+              JumpListData* data,
               size_t max_items);
+  // Creates a ShellLinkItem object for each tab in the given |window| and add
+  // to |data|.
   void AddWindow(const sessions::TabRestoreService::Window& window,
-                 ShellLinkItemList* list,
+                 JumpListData* data,
                  size_t max_items);
 
   // Starts loading a favicon for each URL in |icon_urls_|.
@@ -176,6 +177,14 @@ 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 +195,12 @@ 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_;