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 6c2cf102a2c1e746edaa632bffe444ed3831a0ed..a387666a5adb9f2930a31ae543b2a55537e8aaf4 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.

[achuithb, 2017/04/16 23:50:36]

Isn't PIN better since it's an abbreviation?

[jdufault, 2017/04/17 20:36:08]

Done.

 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};