Extracts parameters to WindowTreeHostMus into structure

ui/aura/mus/window_tree_client.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 "ui/aura/mus/window_tree_client.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 26 matching lines @@
 #include "ui/aura/mus/mus_context_factory.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_mus.h"
 #include "ui/aura/mus/window_port_mus.h"
 #include "ui/aura/mus/window_tree_client_delegate.h"
 #include "ui/aura/mus/window_tree_client_observer.h"
 #include "ui/aura/mus/window_tree_client_test_observer.h"
 #include "ui/aura/mus/window_tree_host_mus.h"
+#include "ui/aura/mus/window_tree_host_mus_init_params.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_tracker.h"
 #include "ui/base/layout.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/display/screen.h"
 #include "ui/events/event.h"
 #include "ui/gfx/geometry/dip_util.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/geometry/size.h"
@@ skipping 52 matching lines @@
   }
 
  private:
   std::unique_ptr<EventResultCallback> ack_callback_;
   bool handled_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(EventAckHandler);
 };
 
 WindowTreeHostMus* GetWindowTreeHostMus(Window* window) {
-  return static_cast<WindowTreeHostMus*>(window->GetRootWindow()->GetHost());
+  return WindowTreeHostMus::ForWindow(window);
 }
 
 WindowTreeHostMus* GetWindowTreeHostMus(WindowMus* window) {
   return GetWindowTreeHostMus(window->GetWindow());
 }
 
 bool IsInternalProperty(const void* key) {
   return key == client::kModalKey;
 }
 
@@ skipping 328 matching lines @@
 
 std::unique_ptr<WindowTreeHostMus> WindowTreeClient::CreateWindowTreeHost(
     WindowMusType window_mus_type,
     const ui::mojom::WindowData& window_data,
     int64_t display_id,
     const cc::FrameSinkId& frame_sink_id,
     const base::Optional<cc::LocalSurfaceId>& local_surface_id) {
   std::unique_ptr<WindowPortMus> window_port =
       CreateWindowPortMus(window_data, window_mus_type);
   roots_.insert(window_port.get());
+  WindowTreeHostMusInitParams init_params;
+  init_params.window_port = std::move(window_port);
+  init_params.window_tree_client = this;
+  init_params.display_id = display_id;
+  init_params.frame_sink_id = frame_sink_id;
   std::unique_ptr<WindowTreeHostMus> window_tree_host =
-      base::MakeUnique<WindowTreeHostMus>(std::move(window_port), this,
-                                          display_id, frame_sink_id);
+      base::MakeUnique<WindowTreeHostMus>(std::move(init_params));
   window_tree_host->InitHost();
   SetLocalPropertiesFromServerProperties(
       WindowMus::Get(window_tree_host->window()), window_data);
   if (window_data.visible) {
     SetWindowVisibleFromServer(WindowMus::Get(window_tree_host->window()),
                                true);
   }
   WindowMus* window = WindowMus::Get(window_tree_host->window());
 
   SetWindowBoundsFromServer(window, window_data.bounds, local_surface_id);
@@ skipping 1484 matching lines @@
   return ScheduleInFlightChange(base::MakeUnique<InFlightCaptureChange>(
       this, capture_synchronizer_.get(), window));
 }
 
 uint32_t WindowTreeClient::CreateChangeIdForFocus(WindowMus* window) {
   return ScheduleInFlightChange(base::MakeUnique<InFlightFocusChange>(
       this, focus_synchronizer_.get(), window));
 }
 
 }  // namespace aura