Makes PlatformEventSource creation in Env conditional

ui/views/examples/content_client/examples_browser_main_parts.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/views/examples/content_client/examples_browser_main_parts.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 42 matching lines @@
 #if defined(OS_CHROMEOS)
   gfx::Screen::SetScreenInstance(
       gfx::SCREEN_TYPE_NATIVE, aura::TestScreen::Create());
   // Set up basic pieces of views::corewm.
   wm_test_helper_.reset(new wm::WMTestHelper(gfx::Size(800, 600)));
   // Ensure the X window gets mapped.
   wm_test_helper_->host()->Show();
   // Ensure Aura knows where to open new windows.
   window_context = wm_test_helper_->host()->window();
 #else
-  aura::Env::CreateInstance();
+  aura::Env::CreateInstance(true);
   gfx::Screen::SetScreenInstance(
       gfx::SCREEN_TYPE_NATIVE, CreateDesktopScreen());
 #endif
   views_delegate_.reset(new DesktopTestViewsDelegate);
 
   ShowExamplesWindowWithContent(
       QUIT_ON_CLOSE, browser_context_.get(), window_context);
 }
 
 void ExamplesBrowserMainParts::PostMainMessageLoopRun() {
   browser_context_.reset();
 #if defined(OS_CHROMEOS)
   wm_test_helper_.reset();
 #endif
   views_delegate_.reset();
   aura::Env::DeleteInstance();
 }
 
 bool ExamplesBrowserMainParts::MainMessageLoopRun(int* result_code) {
   base::RunLoop run_loop;
   run_loop.Run();
   return true;
 }
 
 }  // namespace examples
 }  // namespace views