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, 39 insertions, 0 deletions

diff --git a/chrome/browser/profiles/startup_task_runner_service_factory.h b/chrome/browser/profiles/startup_task_runner_service_factory.h
new file mode 100644
index 0000000..58bb4db
--- /dev/null
+++ b/chrome/browser/profiles/startup_task_runner_service_factory.h
@@ -0,0 +1,39 @@
+// 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.
+
+#ifndef CHROME_BROWSER_PROFILES_STARTUP_TASK_RUNNER_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_PROFILES_STARTUP_TASK_RUNNER_SERVICE_FACTORY_H_
+
+#include "base/basictypes.h"
+#include "base/memory/singleton.h"
+#include "chrome/browser/profiles/profile_keyed_service_factory.h"
+
+class StartupTaskRunnerService;
+class PrefRegistrySyncable;
+class Profile;
+
+// Singleton that owns the start-up task runner service.
+class StartupTaskRunnerServiceFactory : public ProfileKeyedServiceFactory {
+ public:
+  // Returns the instance of StartupTaskRunnerService associated with this
+  // profile (creating one if none exists).
+  static StartupTaskRunnerService* GetForProfile(Profile* profile);
+
+  // Returns an instance of the StartupTaskRunnerServiceFactory singleton.
+  static StartupTaskRunnerServiceFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<StartupTaskRunnerServiceFactory>;
+
+  StartupTaskRunnerServiceFactory();
+  virtual ~StartupTaskRunnerServiceFactory();
+
+  // ProfileKeyedServiceFactory:
+  virtual ProfileKeyedService* BuildServiceInstanceFor(
+      Profile* profile) const OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(StartupTaskRunnerServiceFactory);
+};
+
+#endif  // CHROME_BROWSER_PROFILES_STARTUP_TASK_RUNNER_SERVICE_FACTORY_H_