Filter out redundant jumplist updates.

chrome/browser/jumplist_win.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_JUMPLIST_WIN_H_
 #define CHROME_BROWSER_JUMPLIST_WIN_H_
 
 #include <list>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "base/task/cancelable_task_tracker.h"
+#include "base/time/time.h"
 #include "chrome/browser/jumplist_updater_win.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/sessions/tab_restore_service.h"
 #include "chrome/browser/sessions/tab_restore_service_observer.h"
 #include "components/history/core/browser/history_service.h"
 #include "components/history/core/browser/history_types.h"
 #include "components/history/core/browser/top_sites_observer.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
@@ skipping 128 matching lines @@
   base::FilePath icon_dir_;
 
   // Items in the "Most Visited" category of the application JumpList,
   // protected by the list_lock_.
   ShellLinkItemList most_visited_pages_;
 
   // Items in the "Recently Closed" category of the application JumpList,
   // protected by the list_lock_.
   ShellLinkItemList recently_closed_pages_;
 
+  // Track the last time a jumplist update was requested, and the last time
+  // such an update was requested. These are protected by list_lock_.

[gab, 2015/03/31 13:10:14]

s/requested/started

[gab, 2015/03/31 13:10:14]

s/list_lock_/|list_lock_|

+  base::TimeTicks lastUpdateRequested_;

[jochen (gone - plz use gerrit), 2015/03/31 10:28:52]

last_update_requested_

+  base::TimeTicks lastUpdateStarted_;
+
   // A list of URLs we need to retrieve their favicons,
   // protected by the list_lock_.
   typedef std::pair<std::string, scoped_refptr<ShellLinkItem> > URLPair;
   std::list<URLPair> icon_urls_;
 
   // Id of last favicon task. It's used to cancel current task if a new one
   // comes in before it finishes.
   base::CancelableTaskTracker::TaskId task_id_;
 
   // Lock for most_visited_pages_, recently_closed_pages_, icon_urls_
   // as they may be used by up to 3 threads.
   base::Lock list_lock_;
 
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<JumpList> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(JumpList);
 };
 
 #endif  // CHROME_BROWSER_JUMPLIST_WIN_H_