cros: Add flag to enable pin on sign-in screen.

chrome/common/chrome_features.cc

Index: chrome/common/chrome_features.cc
diff --git a/chrome/common/chrome_features.cc b/chrome/common/chrome_features.cc
index d65c80755fcfb9db18495787b914acdbdd7a5bc6..3949411d8017577a9bb1f6dcbf7f27590ad778d0 100644
--- a/chrome/common/chrome_features.cc
+++ b/chrome/common/chrome_features.cc
@@ -311,10 +311,14 @@ const base::Feature kUseGroupedPermissionInfobars{
 const base::Feature kOptInImeMenu{"OptInImeMenu",
                                   base::FEATURE_ENABLED_BY_DEFAULT};
 
-// Enables or disables PIN quick unlock.
+// Enables or disables pin quick unlock.
 const base::Feature kQuickUnlockPin{"QuickUnlockPin",
                                     base::FEATURE_ENABLED_BY_DEFAULT};
 
+// Enables pin on the login screen.
+const base::Feature kQuickUnlockPinSignin{"QuickUnlockPinSignin",
+                                          base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Enables or disables fingerprint quick unlock.
 const base::Feature kQuickUnlockFingerprint{"QuickUnlockFingerprint",
                                             base::FEATURE_DISABLED_BY_DEFAULT};