Makes display roots be destroyed by client

services/ui/public/cpp/tests/window_server_test_base.cc

 // Copyright 2015 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 "services/ui/public/cpp/tests/window_server_test_base.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
@@ skipping 135 matching lines @@
   if (window_manager_delegate_)
     window_manager_delegate_->OnWmClientJankinessChanged(client_windows, janky);
 }
 
 void WindowServerTestBase::OnWmNewDisplay(Window* window,
                                           const display::Display& display) {
   if (window_manager_delegate_)
     window_manager_delegate_->OnWmNewDisplay(window, display);
 }
 
+void WindowServerTestBase::OnWmDisplayRemoved(Window* window) {
+  if (window_manager_delegate_)
+    window_manager_delegate_->OnWmDisplayRemoved(window);
+}
+
 void WindowServerTestBase::OnWmPerformMoveLoop(
     Window* window,
     mojom::MoveLoopSource source,
     const gfx::Point& cursor_location,
     const base::Callback<void(bool)>& on_done) {
   if (window_manager_delegate_) {
     window_manager_delegate_->OnWmPerformMoveLoop(window, source,
                                                   cursor_location, on_done);
   }
 }
@@ skipping 10 matching lines @@
              : mojom::EventResult::UNHANDLED;
 }
 
 void WindowServerTestBase::Create(const shell::Identity& remote_identity,
                                   mojom::WindowTreeClientRequest request) {
   window_tree_clients_.insert(
       base::MakeUnique<WindowTreeClient>(this, nullptr, std::move(request)));
 }
 
 }  // namespace ui