mus: Make sure only valid user-ids can be active.

components/mus/ws/cursor_unittest.cc

 // 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.
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 37 matching lines @@
         new WindowServer(&window_server_delegate_,
                          scoped_refptr<SurfacesState>(new SurfacesState)));
     window_server_delegate_.set_window_server(window_server_.get());
 
     window_server_delegate_.set_num_displays_to_create(1);
 
     // As a side effect, this allocates Displays.
     WindowManagerWindowTreeFactorySetTestApi(
         window_server_->window_manager_window_tree_factory_set())
         .Add(kTestId1);
+    window_server_->user_id_tracker()->AddUserId(kTestId1);
     window_server_->user_id_tracker()->SetActiveUserId(kTestId1);
   }
 
   ServerWindow* GetRoot() {
     DisplayManager* display_manager = window_server_->display_manager();
     //    ASSERT_EQ(1u, display_manager->displays().size());
     Display* display = *display_manager->displays().begin();
     return display->GetWindowManagerDisplayRootForUser(kTestId1)->root();
   }
 
@@ skipping 120 matching lines @@
   MoveCursorTo(gfx::Point(15, 15));
   EXPECT_EQ(mojom::Cursor::EAST_RESIZE, mojom::Cursor(cursor_id_));
 
   win->SetBounds(gfx::Rect(0, 0, 30, 30));
   EXPECT_EQ(mojom::Cursor::IBEAM, mojom::Cursor(cursor_id_));
 }
 
 }  // namespace test
 }  // namespace ws
 }  // namespace mus