Converts WindowTreeClientTest to be in terms of aura

ui/aura/mus/window_port_mus.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 "ui/aura/mus/window_port_mus.h"
 
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/transient_window_client.h"
 #include "ui/aura/mus/property_converter.h"
 #include "ui/aura/mus/surface_id_handler.h"
@@ skipping 314 matching lines @@
 WindowPortMus::PrepareForServerVisibilityChange(bool value) {
   std::unique_ptr<WindowMusChangeDataImpl> data(
       base::MakeUnique<WindowMusChangeDataImpl>());
   ServerChangeData change_data;
   change_data.visible = value;
   data->change = base::MakeUnique<ScopedServerChange>(
       this, ServerChangeType::VISIBLE, change_data);
   return std::move(data);
 }
 
+void WindowPortMus::PrepareForDestroy() {
+  ScheduleChange(ServerChangeType::DESTROY, ServerChangeData());
+}
+
 void WindowPortMus::PrepareForTransientRestack(WindowMus* window) {
   ServerChangeData change_data;
   change_data.child_id = window->server_id();
   ScheduleChange(ServerChangeType::TRANSIENT_REORDER, change_data);
 }
 
 void WindowPortMus::OnTransientRestackDone(WindowMus* window) {
   ServerChangeData change_data;
   change_data.child_id = window->server_id();
   const bool removed = RemoveChangeByTypeAndData(
@@ skipping 69 matching lines @@
   change_data.property_name =
       GetPropertyConverter()->GetTransportNameForPropertyKey(key);
   // TODO(sky): investigate to see if we need to compare data. In particular do
   // we ever have a case where changing a property cascades into changing the
   // same property?
   if (!RemoveChangeByTypeAndData(ServerChangeType::PROPERTY, change_data))
     window_tree_client_->OnWindowMusPropertyChanged(this, key, std::move(data));
 }
 
 }  // namespace aura