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

chrome/browser/signin/easy_unlock.h

+// 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.
+
+#ifndef CHROME_BROWSER_SIGNIN_EASY_UNLOCK_H_
+#define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_H_
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
+class Profile;
+
+namespace easy_unlock {
+
+// Registers Easy Unlock profile preferences.
+void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+
+// Launches Easy Unlock Setup app.
+void LaunchEasyUnlockSetup(Profile* profile);
+
+}  // namespace easy_unlock
+
+#endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_H_