[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..1f98ae5d34fdd40dc5e44dccb924420ff2066165 100644
--- a/components/proximity_auth/proximity_auth_system.h
+++ b/components/proximity_auth/proximity_auth_system.h
@@ -10,6 +10,7 @@
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "base/time/clock.h"
 #include "components/cryptauth/remote_device.h"
 #include "components/proximity_auth/remote_device_life_cycle.h"
 #include "components/proximity_auth/screenlock_bridge.h"
@@ -18,6 +19,7 @@
 namespace proximity_auth {
 
 class ProximityAuthClient;
+class ProximityAuthPrefManager;
 class RemoteDeviceLifeCycle;
 class UnlockManager;
 
@@ -69,7 +71,9 @@ class ProximityAuthSystem : public RemoteDeviceLifeCycle::Observer,
   // Exposed for testing.
   ProximityAuthSystem(ScreenlockType screenlock_type,
                       ProximityAuthClient* proximity_auth_client,
-                      std::unique_ptr<UnlockManager> unlock_manager);
+                      std::unique_ptr<UnlockManager> unlock_manager,
+                      std::unique_ptr<base::Clock> clock,
+                      std::unique_ptr<ProximityAuthPrefManager> pref_manager);
 
   // Creates the RemoteDeviceLifeCycle for |remote_device|.
   // Exposed for testing.
@@ -92,6 +96,10 @@ 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_;
 
@@ -105,6 +113,12 @@ class ProximityAuthSystem : public RemoteDeviceLifeCycle::Observer,
   // Handles the interaction with the lock screen UI.
   std::unique_ptr<UnlockManager> unlock_manager_;
 
+  // Used to get the current timestamp.
+  std::unique_ptr<base::Clock> clock_;
+
+  // Fetches EasyUnlock preferences.
+  std::unique_ptr<ProximityAuthPrefManager> pref_manager_;
+
   // True if the system is suspended.
   bool suspended_;