Setup DiscardableMemory in the ash process

ash/mus/window_manager_unittest.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 <map>
 #include <memory>
 #include <vector>
 
 #include "ash/public/interfaces/constants.mojom.h"
 #include "base/bind.h"
@@ skipping 73 matching lines @@
       display::Display(1, gfx::Rect(0, 0, 200, 200)),
       display::DisplayList::Type::PRIMARY);
   display::Screen::SetScreenInstance(&screen);
 
   WindowTreeClientDelegate window_tree_delegate;
 
   connector()->Connect(mojom::kServiceName);
 
   // Connect to mus and create a new top level window. The request goes to
   // |ash|, but is async.
-  aura::WindowTreeClient client(connector(), &window_tree_delegate);
+  aura::WindowTreeClient client(connector(), &window_tree_delegate, nullptr,
+                                nullptr, nullptr, false);
   client.ConnectViaWindowTreeFactory();
   aura::test::EnvTestHelper().SetWindowTreeClient(&client);
   std::map<std::string, std::vector<uint8_t>> properties;
   properties[ui::mojom::WindowManager::kWindowType_InitProperty] =
       mojo::ConvertTo<std::vector<uint8_t>>(
           static_cast<int32_t>(ui::mojom::WindowType::WINDOW));
   aura::WindowTreeHostMus window_tree_host_mus(&client, &properties);
   window_tree_host_mus.InitHost();
   aura::Window* child_window = new aura::Window(nullptr);
   child_window->Init(ui::LAYER_NOT_DRAWN);
   window_tree_host_mus.window()->AddChild(child_window);
 
   // Create another WindowTreeClient by way of embedding in
   // |child_window|. This blocks until it succeeds.
   ui::mojom::WindowTreeClientPtr tree_client;
   auto tree_client_request = MakeRequest(&tree_client);
   client.Embed(child_window, std::move(tree_client), 0u, base::Bind(&OnEmbed));
   aura::WindowTreeClient child_client(connector(), &window_tree_delegate,
-                                      nullptr, std::move(tree_client_request));
+                                      nullptr, std::move(tree_client_request),
+                                      nullptr, false);
   window_tree_delegate.WaitForEmbed();
   ASSERT_TRUE(!child_client.GetRoots().empty());
   window_tree_delegate.DestroyWindowTreeHost();
 }
 
 }  // namespace mus
 }  // namespace ash