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

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index fbe03df5354bd71d7a61cc1094bd9cf2fa322ed1..15d14734b75dcf434cbd799ec91fc52fb68a51b3 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -2666,4 +2666,14 @@ const char kPartnerBookmarkMappings[] = "partnerbookmarks.mappings";
 
 // Whether DNS Quick Check is disabled in proxy resolution.
 const char kQuickCheckEnabled[] = "proxy.quick_check_enabled";
+
+// Whether Easy Unlock is enabled.
+extern const char kEasyUnlockEnabled[] = "easy_unlock.enabled";
+
+// Whether to show the Easy Unlock first run tutorial.
+extern const char kEasyUnlockShowTutorial[] = "easy_unlock.show_tutorial";
+
+// Preference storing Easy Unlock pairing data.
+extern const char kEasyUnlockPairing[] = "easy_unlock.pairing";
+
 }  // namespace prefs