Delay bookmarks load while the profile is loading.

chrome/browser/bookmarks/bookmark_model.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_BOOKMARKS_BOOKMARK_MODEL_H_
 #define CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_
 
 #include <set>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/deferred_sequenced_task_runner.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/observer_list.h"
 #include "base/string16.h"
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "chrome/browser/bookmarks/bookmark_service.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/common/cancelable_task_tracker.h"
 #include "content/public/browser/notification_observer.h"
@@ skipping 208 matching lines @@
   explicit BookmarkModel(Profile* profile);
   virtual ~BookmarkModel();
 
   // Invoked prior to destruction to release any necessary resources.
   virtual void Shutdown() OVERRIDE;
 
   // Loads the bookmarks. This is called upon creation of the
   // BookmarkModel. You need not invoke this directly.
   void Load();
 
+  // Starts loading the bookmarks. This is decoupled from Load, giving the
+  // caller the possibility to start loading the bookmarks after the
+  // creation of the BookmarkModel.
+  void StartLoading();
+
   // Returns true if the model finished loading.
   // This is virtual so it can be mocked.
   virtual bool IsLoaded() const;
 
   // Returns the root node. The 'bookmark bar' node and 'other' node are
   // children of the root node.
   const BookmarkNode* root_node() { return &root_; }
 
   // Returns the 'bookmark bar' node. This is NULL until loaded.
   const BookmarkNode* bookmark_bar_node() { return bookmark_bar_node_; }
@@ skipping 226 matching lines @@
 
   // Sets the maximum node ID to the given value.
   // This is used by BookmarkCodec to report the maximum ID after it's done
   // decoding since during decoding codec assigns node IDs.
   void set_next_node_id(int64 id) { next_node_id_ = id; }
 
   // Creates and returns a new BookmarkLoadDetails. It's up to the caller to
   // delete the returned object.
   BookmarkLoadDetails* CreateLoadDetails();
 
+  // Returns sequenced task runner where all bookmarks I/O operations are
+  // performed.
+  scoped_refptr<base::DeferredSequencedTaskRunner> GetBookmarkTaskRunner();
+
   content::NotificationRegistrar registrar_;
 
   Profile* profile_;
 
   // Whether the initial set of data has been loaded.
   bool loaded_;
 
   // The root node. This contains the bookmark bar node and the 'other' node as
   // children.
   BookmarkNode root_;
@@ skipping 24 matching lines @@
 
   scoped_ptr<BookmarkIndex> index_;
 
   base::WaitableEvent loaded_signal_;
 
   // See description of IsDoingExtensiveChanges above.
   int extensive_changes_;
 
   scoped_ptr<BookmarkExpandedStateTracker> expanded_state_tracker_;
 
+  scoped_refptr<base::DeferredSequencedTaskRunner> bookmark_task_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(BookmarkModel);
 };
 
 #endif  // CHROME_BROWSER_BOOKMARKS_BOOKMARK_MODEL_H_