[EasyUnlock] Make login work if command line flag is enabled.

components/proximity_auth/proximity_auth_system.cc

Index: components/proximity_auth/proximity_auth_system.cc
diff --git a/components/proximity_auth/proximity_auth_system.cc b/components/proximity_auth/proximity_auth_system.cc
index 027a5471ff0efa716f1062f1c3f5a23c812d51f8..d44381e07fcb1b3763722e5a268c4cd69a310795 100644
--- a/components/proximity_auth/proximity_auth_system.cc
+++ b/components/proximity_auth/proximity_auth_system.cc
@@ -25,7 +25,8 @@ const int64_t kPasswordReauthPeriodHours = 20;
 ProximityAuthSystem::ProximityAuthSystem(
     ScreenlockType screenlock_type,
     ProximityAuthClient* proximity_auth_client)
-    : proximity_auth_client_(proximity_auth_client),
+    : screenlock_type_(screenlock_type),
+      proximity_auth_client_(proximity_auth_client),
       unlock_manager_(
           new UnlockManagerImpl(screenlock_type, proximity_auth_client)),
       clock_(new base::DefaultClock()),
@@ -41,7 +42,8 @@ ProximityAuthSystem::ProximityAuthSystem(
     std::unique_ptr<UnlockManager> unlock_manager,
     std::unique_ptr<base::Clock> clock,
     std::unique_ptr<ProximityAuthPrefManager> pref_manager)
-    : proximity_auth_client_(proximity_auth_client),
+    : screenlock_type_(screenlock_type),
+      proximity_auth_client_(proximity_auth_client),
       unlock_manager_(std::move(unlock_manager)),
       clock_(std::move(clock)),
       pref_manager_(std::move(pref_manager)),
@@ -189,6 +191,11 @@ void ProximityAuthSystem::OnFocusedUserChanged(const AccountId& account_id) {
 }
 
 bool ProximityAuthSystem::ShouldForcePassword() {
+  // TODO(tengs): We need to properly propagate the last login time to the login
+  // screen.
+  if (screenlock_type_ == ScreenlockType::SIGN_IN)
+    return false;
+
   // TODO(tengs): Put this force password reauth logic behind an enterprise
   // policy. See crbug.com/724717.
   int64_t now_ms = clock_->Now().ToJavaTime();