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

components/proximity_auth/proximity_auth_system.h

Index: components/proximity_auth/proximity_auth_system.h
diff --git a/components/proximity_auth/proximity_auth_system.h b/components/proximity_auth/proximity_auth_system.h
index 31586db318f0d5f517eaeda6ca0503c7a771b028..d3f0e50e6086662456413ce876edd74c6c64b8c4 100644
--- a/components/proximity_auth/proximity_auth_system.h
+++ b/components/proximity_auth/proximity_auth_system.h
@@ -92,6 +92,10 @@ class ProximityAuthSystem : public RemoteDeviceLifeCycle::Observer,
   // timeout.
   void ResumeAfterWakeUpTimeout();
 
+  // Returns true if the user should be forced to use a password to authenticate
+  // rather than EasyUnlock.
+  bool ShouldForcePassword();
+
   // Lists of remote devices, keyed by user account id.
   std::map<AccountId, cryptauth::RemoteDeviceList> remote_devices_map_;