platform-window: Add a PlatformWindowFactory for creating windows.

ui/aura/window_tree_host_win.cc

 // Copyright (c) 2012 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/window_tree_host_win.h"
 
 #include <windows.h>
 
 #include <algorithm>
 
 #include "base/message_loop/message_loop.h"
 #include "ui/aura/client/cursor_client.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/cursor/cursor_loader_win.h"
 #include "ui/base/view_prop.h"
 #include "ui/compositor/compositor.h"
 #include "ui/events/event.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/insets.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/screen.h"
-#include "ui/platform_window/win/win_window.h"
+#include "ui/platform_window/platform_window_factory.h"
+#include "ui/platform_window/types/platform_window.h"
 
 using std::max;
 using std::min;
 
 namespace aura {
 namespace {
 
 bool use_popup_as_root_window_for_test = false;
 
 }  // namespace
 
 // static
 WindowTreeHost* WindowTreeHost::Create(const gfx::Rect& bounds) {
   return new WindowTreeHostWin(bounds);
 }
 
 // static
 gfx::Size WindowTreeHost::GetNativeScreenSize() {
   return gfx::Size(GetSystemMetrics(SM_CXSCREEN),
                    GetSystemMetrics(SM_CYSCREEN));
 }
 
 WindowTreeHostWin::WindowTreeHostWin(const gfx::Rect& bounds)
     : has_capture_(false),
       widget_(gfx::kNullAcceleratedWidget),
-      window_(new ui::WinWindow(this, bounds)) {
+      window_(ui::PlatformWindowFactory::GetInstance()->CreatePlatformWindow(
+          this,
+          bounds)) {
+  CHECK(window_);
 }
 
 WindowTreeHostWin::~WindowTreeHostWin() {
   DestroyCompositor();
   DestroyDispatcher();
   window_.reset();
 }
 
 ui::EventSource* WindowTreeHostWin::GetEventSource() {
   return this;
@@ skipping 105 matching lines @@
   widget_ = widget;
   CreateCompositor(widget);
 }
 
 void WindowTreeHostWin::OnActivationChanged(bool active) {
   if (active)
     OnHostActivated();
 }
 
 }  // namespace aura