Launch easy unlock setup app from chrome://settings.

chrome/browser/signin/easy_unlock.cc

 // Copyright 2014 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/signin/easy_unlock_controller.h"
+#include "chrome/browser/signin/easy_unlock.h"
 
 #include "base/values.h"
+#include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/extensions/application_launch.h"
 #include "chrome/common/pref_names.h"
 #include "components/user_prefs/pref_registry_syncable.h"
+#include "extensions/browser/extension_system.h"
 
-// static.
-void EasyUnlockController::RegisterProfilePrefs(
+namespace easy_unlock {
+
+void RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
   registry->RegisterBooleanPref(
       prefs::kEasyUnlockEnabled,
       false,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterBooleanPref(
       prefs::kEasyUnlockShowTutorial,
       false,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
   registry->RegisterDictionaryPref(
       prefs::kEasyUnlockPairing,
       new base::DictionaryValue(),
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
+
+void LaunchEasyUnlockSetup(Profile* profile) {
+  ExtensionService* service =
+      extensions::ExtensionSystem::Get(profile)->extension_service();
+  const extensions::Extension* extension =
+      service->GetExtensionById(extension_misc::kEasyUnlockAppId, false);
+
+  OpenApplication(AppLaunchParams(
+      profile, extension, extensions::LAUNCH_CONTAINER_WINDOW, NEW_WINDOW));
+}
+
+}  // namespace easy_unlock