Makes construction of (ash)RemoteWindowTreeHostWin explicit

ash/display/mirror_window_controller.cc

 // Copyright (c) 2013 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 "ash/display/mirror_window_controller.h"
 
 #if defined(USE_X11)
 #include <X11/Xlib.h>
 
 // Xlib.h defines RootWindow.
 #undef RootWindow
 #endif
 
 #include "ash/display/cursor_window_controller.h"
 #include "ash/display/display_controller.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_manager.h"
 #include "ash/display/root_window_transformers.h"
 #include "ash/host/ash_window_tree_host.h"
+#include "ash/host/ash_window_tree_host_init_params.h"
 #include "ash/host/root_window_transformer.h"
 #include "ash/root_window_settings.h"
 #include "ash/shell.h"
 #include "base/strings/stringprintf.h"
 #include "ui/aura/client/capture_client.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/layout.h"
 #include "ui/compositor/reflector.h"
@@ skipping 44 matching lines @@
 MirrorWindowController::MirrorWindowController() {}
 
 MirrorWindowController::~MirrorWindowController() {
   // Make sure the root window gets deleted before cursor_window_delegate.
   Close();
 }
 
 void MirrorWindowController::UpdateWindow(const DisplayInfo& display_info) {
   static int mirror_host_count = 0;
   if (!ash_host_.get()) {
-    const gfx::Rect& bounds_in_native = display_info.bounds_in_native();
-    ash_host_.reset(AshWindowTreeHost::Create(bounds_in_native));
+    AshWindowTreeHostInitParams init_params;
+    init_params.initial_bounds = display_info.bounds_in_native();
+    ash_host_.reset(AshWindowTreeHost::Create(init_params));
     aura::WindowTreeHost* host = ash_host_->AsWindowTreeHost();
     host->window()->SetName(
         base::StringPrintf("MirrorRootWindow-%d", mirror_host_count++));
     host->compositor()->SetBackgroundColor(SK_ColorBLACK);
     // No need to remove the observer because the DisplayController outlives the
     // host.
     host->AddObserver(Shell::GetInstance()->display_controller());
     host->AddObserver(this);
     // TODO(oshima): TouchHUD is using idkey.
     InitRootWindowSettings(host->window())->display_id = display_info.id();
@@ skipping 76 matching lines @@
       display_manager->mirrored_display_id());
   const DisplayInfo& source_display_info = display_manager->GetDisplayInfo(
       Shell::GetScreen()->GetPrimaryDisplay().id());
   DCHECK(display_manager->IsMirrored());
   return scoped_ptr<RootWindowTransformer>(
       CreateRootWindowTransformerForMirroredDisplay(source_display_info,
                                                     mirror_display_info));
 }
 
 }  // namespace ash