Delay updating jumplist to avoid blocking the file thread at start-up

chrome/browser/ui/views/load_complete_listener.h

Index: chrome/browser/ui/views/load_complete_listener.h
diff --git a/chrome/browser/ui/views/load_complete_listener.h b/chrome/browser/ui/views/load_complete_listener.h
new file mode 100644
index 0000000000000000000000000000000000000000..879a9791a3d933552063f3690bdf902684be0e47
--- /dev/null
+++ b/chrome/browser/ui/views/load_complete_listener.h
@@ -0,0 +1,50 @@
+// 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_UI_VIEWS_LOAD_COMPLETE_LISTENER_H_
+#define CHROME_BROWSER_UI_VIEWS_LOAD_COMPLETE_LISTENER_H_
+
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/notification_observer.h"
+
+namespace content {
+class NotificationSource;
+class NotificationRegistrar;
+class NotificationDetails;
+}
+
+// A class which takes  a delegate which can be notified after the first page
+// load has been completed. This is particularly useful for triggering
+// IO-intensive tasks which should not be run until start-up is complete.
+class LoadCompleteListener
+    : public content::NotificationObserver {
+ public:
+  class Delegate {
+   public:
+    // Invoked when initial page load has completed.
+    virtual void OnLoadCompleted() = 0;
+
+   protected:
+    virtual ~Delegate() {}
+  };
+
+  explicit LoadCompleteListener(Delegate* delegate);
+
+  virtual ~LoadCompleteListener();
+
+  // NotificationObserver implementation.
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+ private:
+  content::NotificationRegistrar* registrar_;
+
+  // Delegate to be notified after the first page load has completed.
+  Delegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(LoadCompleteListener);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_LOAD_COMPLETE_LISTENER_H_