mus: Add a missing InitHost() call to fix a test.

services/ui/ws/window_manager_client_unittest.cc

 // Copyright 2014 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 <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 712 matching lines @@
 
 TEST_F(WindowServerTest, OnWindowHierarchyChangedIncludesTransientParent) {
   // Create a second connection. In the second connection create a window,
   // parent it to the root, create another window, mark it as a transient parent
   // of the first window and then add it.
   EstablishConnectionViaFactoryDelegate delegate(window_manager());
   set_window_manager_delegate(&delegate);
   aura::WindowTreeClient second_client(connector(), this);
   second_client.ConnectViaWindowTreeFactory();
   aura::WindowTreeHostMus window_tree_host_in_second_client(&second_client);
+  window_tree_host_in_second_client.InitHost();
   aura::Window* second_client_child = NewVisibleWindow(
       window_tree_host_in_second_client.window(), &second_client);
   std::unique_ptr<aura::WindowPortMus> window_port_mus =
       base::MakeUnique<aura::WindowPortMus>(&second_client,
                                             aura::WindowMusType::LOCAL);
   // Create the transient without a parent, set transient parent, then add.
   aura::Window* transient = NewVisibleWindow(nullptr, &second_client);
   aura::client::TransientWindowClient* transient_window_client =
       aura::client::GetTransientWindowClient();
   transient_window_client->AddTransientChild(second_client_child, transient);
   second_client_child->AddChild(transient);
 
   // Wait for the top-level to appear in the window manager.
   ASSERT_TRUE(delegate.QuitOnCreate());
   aura::Window* top_level_in_wm = delegate.created_window();
 
   // Makes sure the window manager sees the same structure and the transient
   // parent is connected correctly.
   ASSERT_TRUE(WaitForTreeSizeToMatch(top_level_in_wm, 3u));
   ASSERT_EQ(1u, top_level_in_wm->children().size());
   aura::Window* second_client_child_in_wm = top_level_in_wm->children()[0];
   ASSERT_EQ(1u, second_client_child_in_wm->children().size());
   aura::Window* transient_in_wm = second_client_child_in_wm->children()[0];
   ASSERT_EQ(second_client_child_in_wm,
             transient_window_client->GetTransientParent(transient_in_wm));
 }
 
 }  // namespace ws
 }  // namespace ui