mash: Run pre-unlock animation via SessionController

ash/public/interfaces/session_controller.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module ash.mojom;
 
 import "components/signin/public/interfaces/account_id.mojom";
 import "ui/gfx/image/mojo/image.mojom";
 
 // Matches session_manager::SessionState.
@@ skipping 116 matching lines @@
   // Updates a user session. This is called when a user session is added or
   // its meta data (e.g. name, avatar) is changed. There is no method to remove
   // a user session because ash/chrome does not support that. All users are
   // logged out at the same time.
   UpdateUserSession(UserSession user_session);
 
   // Sets the order of user sessions. The order is keyed by the session id.
   // Currently, session manager set a LRU order with the first one being the
   // active user session.
   SetUserSessionOrder(array<uint32> user_session_ids);
+
+  // Runs the pre-unlock animation. Invoked by the screen locker before
+  // dismissing. When the mojo call returns, screen locker takes that as a
+  // signal of finished unlock animation and dismisses itself.
+  RunUnlockAnimation() => ();
 };
 
 // Interface for ash to request session service from its client (e.g. Chrome).
 interface SessionControllerClient {
   // Requests to lock screen.
   RequestLockScreen();
 
   // Switch to the active user with |account_id| (if the user has already signed
   // in).
   SwitchActiveUser(signin.mojom.AccountId account_id);
 
   // Switch the active user to the next or previous user.
   CycleActiveUser(CycleUserDirection direction);
 };