Delay bookmarks load while the profile is loading.

chrome/browser/profiles/startup_task_runner_service.cc

+// Copyright (c) 2013 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.
+
+#include "chrome/browser/profiles/startup_task_runner_service.h"
+
+#include "chrome/browser/profiles/profile.h"
+
+StartupTaskRunnerService::StartupTaskRunnerService(Profile* profile)
+    : profile_(profile) {
+}
+
+StartupTaskRunnerService::~StartupTaskRunnerService() {
+}
+
+scoped_refptr<base::DeferredSequencedTaskRunner>
+    StartupTaskRunnerService::GetBookmarkTaskRunner() {
+  if (!bookmark_task_runner_) {

[Jeffrey Yasskin, 2013/04/03 16:25:35]

Are startup tasks only enqueued onto this task runner from one thread? If not,
this isn't thread-safe. If so, please comment the constraint in the header.

[msarda, 2013/04/08 17:37:18]

Done.

+    bookmark_task_runner_ =
+        new base::DeferredSequencedTaskRunner(profile_->GetIOTaskRunner());
+  }
+  return bookmark_task_runner_;
+}
+
+void StartupTaskRunnerService::StartDeferredTaskRunners() {
+  GetBookmarkTaskRunner()->Start();
+}