Delay bookmarks load while the profile is loading.

chrome/browser/bookmarks/bookmark_model.h

Index: chrome/browser/bookmarks/bookmark_model.h
diff --git a/chrome/browser/bookmarks/bookmark_model.h b/chrome/browser/bookmarks/bookmark_model.h
index 1f0cf7b793032ce4608c0791dac2461a908c834a..bb7096fade657614b692e89f51034f53d1a4dde7 100644
--- a/chrome/browser/bookmarks/bookmark_model.h
+++ b/chrome/browser/bookmarks/bookmark_model.h
@@ -10,6 +10,7 @@
 
 #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"
@@ -238,6 +239,11 @@ class BookmarkModel : public content::NotificationObserver,
   // 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;
@@ -484,6 +490,10 @@ class BookmarkModel : public content::NotificationObserver,
   // 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_;
@@ -528,6 +538,8 @@ class BookmarkModel : public content::NotificationObserver,
 
   scoped_ptr<BookmarkExpandedStateTracker> expanded_state_tracker_;
 
+  scoped_refptr<base::DeferredSequencedTaskRunner> bookmark_task_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(BookmarkModel);
 };