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

chrome/browser/prefs/browser_prefs.cc

Index: chrome/browser/prefs/browser_prefs.cc
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index d100644d07eca684f747fc17704cd4f8f95e6efb..1dc94cf3f08c1cdf9db08fb7190f1220053dfcf1 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -68,6 +68,7 @@
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/search_engines/template_url_prepopulate_data.h"
 #include "chrome/browser/services/gcm/gcm_profile_service.h"
+#include "chrome/browser/signin/easy_unlock_controller.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/signin/signin_promo.h"
 #include "chrome/browser/sync/sync_prefs.h"
@@ -347,6 +348,7 @@ void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   chrome_browser_net::Predictor::RegisterProfilePrefs(registry);
   chrome_prefs::RegisterProfilePrefs(registry);
   DownloadPrefs::RegisterProfilePrefs(registry);
+  EasyUnlockController::RegisterProfilePrefs(registry);
   extensions::ExtensionPrefs::RegisterProfilePrefs(registry);
   extensions::launch_util::RegisterProfilePrefs(registry);
   ExtensionWebUI::RegisterProfilePrefs(registry);