aura mus: Install a DefautlCaptureClient in the TestWM.

services/ui/test_wm/test_wm.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 <memory>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "mojo/public/cpp/bindings/binding.h"
 #include "services/service_manager/public/c/main.h"
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/service_manager/public/cpp/service.h"
 #include "services/service_manager/public/cpp/service_context.h"
 #include "services/service_manager/public/cpp/service_runner.h"
+#include "ui/aura/client/default_capture_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/mus/property_converter.h"
 #include "ui/aura/mus/property_utils.h"
 #include "ui/aura/mus/window_manager_delegate.h"
 #include "ui/aura/mus/window_tree_client.h"
 #include "ui/aura/mus/window_tree_client_delegate.h"
 #include "ui/aura/mus/window_tree_host_mus.h"
 #include "ui/aura/test/test_focus_client.h"
 #include "ui/aura/window.h"
 #include "ui/display/display.h"
@@ skipping 98 matching lines @@
     DCHECK_EQ(0u, screen_->display_list().displays().size());
     screen_->display_list().AddDisplay(display,
                                        display::DisplayList::Type::PRIMARY);
   }
   void OnWmNewDisplay(std::unique_ptr<aura::WindowTreeHostMus> window_tree_host,
                       const display::Display& display) override {
     // Only handles a single root.
     DCHECK(!root_);
     window_tree_host_ = std::move(window_tree_host);
     root_ = window_tree_host_->window();
+    default_capture_client_ =
+        base::MakeUnique<aura::client::DefaultCaptureClient>(
+            root_->GetRootWindow());
     DCHECK(window_manager_client_);
     window_manager_client_->AddActivationParent(root_);
     ui::mojom::FrameDecorationValuesPtr frame_decoration_values =
         ui::mojom::FrameDecorationValues::New();
     frame_decoration_values->max_title_bar_button_width = 0;
     window_manager_client_->SetFrameDecorationValues(
         std::move(frame_decoration_values));
     aura::client::SetFocusClient(root_, &focus_client_);
   }
   void OnWmDisplayRemoved(aura::WindowTreeHostMus* window_tree_host) override {
@@ skipping 24 matching lines @@
   std::unique_ptr<display::ScreenBase> screen_;
 
   std::unique_ptr<aura::Env> aura_env_;
   ::wm::WMState wm_state_;
   aura::PropertyConverter property_converter_;
   aura::test::TestFocusClient focus_client_;
   std::unique_ptr<aura::WindowTreeHostMus> window_tree_host_;
   aura::Window* root_ = nullptr;
   aura::WindowManagerClient* window_manager_client_ = nullptr;
   std::unique_ptr<aura::WindowTreeClient> window_tree_client_;
+  std::unique_ptr<aura::client::DefaultCaptureClient> default_capture_client_;
 
   bool started_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(TestWM);
 };
 
 }  // namespace test
 }  // namespace ui
 
 MojoResult ServiceMain(MojoHandle service_request_handle) {
   service_manager::ServiceRunner runner(new ui::test::TestWM);
   return runner.Run(service_request_handle);
 }