[EasyUnlock] Force user to enter their password after 20 hours.

components/proximity_auth/screenlock_state.h

Index: components/proximity_auth/screenlock_state.h
diff --git a/components/proximity_auth/screenlock_state.h b/components/proximity_auth/screenlock_state.h
index 1f090edc4af9b62817db34eb3c3377f760e6519a..8bee1987a6afeddc04088b7daeedf2ab05c4d561 100644
--- a/components/proximity_auth/screenlock_state.h
+++ b/components/proximity_auth/screenlock_state.h
@@ -41,6 +41,9 @@ enum class ScreenlockState {
   PHONE_LOCKED_AND_RSSI_TOO_LOW,
   // The local device can be unlocked using proximity-based authentication.
   AUTHENTICATED,
+  // The user must reauthenticate using their password because a sufficient time
+  // has elapsed since their last password entry.
+  PASSWORD_REAUTH,
 };
 
 }  // namespace proximity_auth