Add Easy Unlock options to chrome://settings behind a flag.

chrome/browser/signin/easy_unlock_controller.h

Index: chrome/browser/signin/easy_unlock_controller.h
diff --git a/chrome/browser/signin/easy_unlock_controller.h b/chrome/browser/signin/easy_unlock_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..b9d53a9780804dfdc98d6adaeb9df7d8c09afab0
--- /dev/null
+++ b/chrome/browser/signin/easy_unlock_controller.h
@@ -0,0 +1,18 @@
+// 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_CONTROLLER_H_
+#define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_CONTROLLER_H_
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
+// Stub class for Easy Unlock features.
+class EasyUnlockController {
+ public:
+  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+};
+
+#endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_CONTROLLER_H_