Makes PlatformEventSource creation in Env conditional

ui/views/examples/examples_main.cc

 // Copyright 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 "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/i18n/icu_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
@@ skipping 48 matching lines @@
   base::i18n::InitializeICU();
 
   base::FilePath pak_dir;
   PathService::Get(base::DIR_MODULE, &pak_dir);
 
   base::FilePath pak_file;
   pak_file = pak_dir.Append(FILE_PATH_LITERAL("ui_test.pak"));
 
   ui::ResourceBundle::InitSharedInstanceWithPakPath(pak_file);
 
-  aura::Env::CreateInstance();
+  aura::Env::CreateInstance(true);
 
   ui::InitializeInputMethodForTesting();
 
   {
     views::DesktopTestViewsDelegate views_delegate;
     wm::WMState wm_state;
 
 #if !defined(OS_CHROMEOS)
     scoped_ptr<gfx::Screen> desktop_screen(views::CreateDesktopScreen());
     gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE,
                                    desktop_screen.get());
 #endif
 
     views::examples::ShowExamplesWindow(
         views::examples::QUIT_ON_CLOSE,
         NULL,
         scoped_ptr<ScopedVector<views::examples::ExampleBase> >());
 
     base::RunLoop().Run();
 
     ui::ResourceBundle::CleanupSharedInstance();
   }
 
   ui::ShutdownInputMethod();
 
   aura::Env::DeleteInstance();
 
   return 0;
 }