ash: Add RootWindowHostFactory class.

ash/display/display_manager.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 "ash/display/display_manager.h"
 
 #include <string>
 #include <vector>
 
 #include "ash/display/display_controller.h"
+#include "ash/host/root_window_host_factory.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "base/command_line.h"
 #include "base/stl_util.h"
 #include "base/string_split.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "grit/ash_strings.h"
 #include "ui/aura/aura_switches.h"
 #include "ui/aura/client/screen_position_client.h"
@@ skipping 292 matching lines @@
 
 #if defined(USE_X11) && defined(OS_CHROMEOS)
   if (!changed_display_indices.empty() && base::chromeos::IsRunningOnChromeOS())
     ui::ClearX11DefaultRootWindow();
 #endif
 }
 
 RootWindow* DisplayManager::CreateRootWindowForDisplay(
     const gfx::Display& display) {
   RootWindow::CreateParams params(display.bounds_in_pixel());
-#if defined(OS_WIN)
-  if (base::win::GetVersion() >= base::win::VERSION_WIN8) {
-    params.host = aura::RemoteRootWindowHostWin::Create(
-        display.bounds_in_pixel());
-  }
-#endif
+  params.host = Shell::GetInstance()->root_window_host_factory()->
+      CreateRootWindowHost(display.bounds_in_pixel());
   aura::RootWindow* root_window = new aura::RootWindow(params);
   // No need to remove RootWindowObserver because
   // the DisplayManager object outlives RootWindow objects.
   root_window->AddRootWindowObserver(this);
   root_window->SetProperty(kDisplayIdKey, display.id());
   root_window->Init();
   return root_window;
 }
 
 gfx::Display* DisplayManager::GetDisplayAt(size_t index) {
@@ skipping 242 matching lines @@
   DisplayList::iterator iter_to_update = to_update->begin();
   DisplayList::const_iterator iter = displays_.begin();
   for (; iter != displays_.end() && iter_to_update != to_update->end();
        ++iter, ++iter_to_update) {
     (*iter_to_update).set_id((*iter).id());
   }
 }
 
 }  // namespace internal
 }  // namespace ash