chromeos: Convert system tray session length limit to mojo

chrome/browser/ui/ash/session_controller_client.h

Index: chrome/browser/ui/ash/session_controller_client.h
diff --git a/chrome/browser/ui/ash/session_controller_client.h b/chrome/browser/ui/ash/session_controller_client.h
index a7e4dc4cd8e32392190d1d8ac103d21c5f7ee346..ca85a87e39c4d9027231179551fbee0072b5dddd 100644
--- a/chrome/browser/ui/ash/session_controller_client.h
+++ b/chrome/browser/ui/ash/session_controller_client.h
@@ -101,6 +101,7 @@ class SessionControllerClient
   FRIEND_TEST_ALL_PREFIXES(SessionControllerClientTest, SendUserSession);
   FRIEND_TEST_ALL_PREFIXES(SessionControllerClientTest, SupervisedUser);
   FRIEND_TEST_ALL_PREFIXES(SessionControllerClientTest, UserPrefsChange);
+  FRIEND_TEST_ALL_PREFIXES(SessionControllerClientTest, SessionLengthLimit);
 
   // Called when the login profile is ready.
   void OnLoginUserProfilePrepared(Profile* profile);
@@ -120,6 +121,9 @@ class SessionControllerClient
   // Sends the order of user sessions to ash.
   void SendUserSessionOrder();
 
+  // Sends the session length time limit to ash.
+  void SendSessionLengthLimit();
+
   // Binds to the client interface.
   mojo::Binding<ash::mojom::SessionControllerClient> binding_;
 
@@ -140,6 +144,9 @@ class SessionControllerClient
   // i.e. they don't much the user session order.
   std::vector<std::unique_ptr<PrefChangeRegistrar>> pref_change_registrars_;
 
+  // Observes changes to Local State prefs.
+  std::unique_ptr<PrefChangeRegistrar> local_state_registrar_;
+
   // Used to suppress duplicate IPCs to ash.
   ash::mojom::SessionInfoPtr last_sent_session_info_;
   ash::mojom::UserSessionPtr last_sent_user_session_;