Delay bookmarks load while the profile is loading.

This CL adds a new DeferredSequencedtaskRunner that queues up tasks
until a first call to Start is issued. It creates such a task runner for the 
execution of bookmarks I/O operations. At profile creation, the bookmarks
task runner is stopped and its execution is started after the profile has
finished loading.

BUG=NONE

Review URL: https://chromiumcodereview.appspot.com/12952005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@194956 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 30 insertions, 0 deletions

diff --git a/chrome/browser/profiles/startup_task_runner_service.cc b/chrome/browser/profiles/startup_task_runner_service.cc
new file mode 100644
index 0000000..60407e1
--- /dev/null
+++ b/chrome/browser/profiles/startup_task_runner_service.cc
@@ -0,0 +1,30 @@
+// 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 "base/deferred_sequenced_task_runner.h"
+#include "base/logging.h"
+#include "chrome/browser/profiles/profile.h"
+
+StartupTaskRunnerService::StartupTaskRunnerService(Profile* profile)
+    : profile_(profile) {
+}
+
+StartupTaskRunnerService::~StartupTaskRunnerService() {
+}
+
+scoped_refptr<base::DeferredSequencedTaskRunner>
+    StartupTaskRunnerService::GetBookmarkTaskRunner() {
+  DCHECK(CalledOnValidThread());
+  if (!bookmark_task_runner_) {
+    bookmark_task_runner_ =
+        new base::DeferredSequencedTaskRunner(profile_->GetIOTaskRunner());
+  }
+  return bookmark_task_runner_;
+}
+
+void StartupTaskRunnerService::StartDeferredTaskRunners() {
+  GetBookmarkTaskRunner()->Start();
+}