Start in extended desktop mode if it is enabled.

ash/shell.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/shell.h"
 
 #include <algorithm>
 #include <string>
 
 #include "ash/accelerators/focus_manager_factory.h"
@@ skipping 162 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // Shell, public:
 
 Shell::Shell(ShellDelegate* delegate)
     : screen_(new ScreenAsh),
       active_root_window_(NULL),
       env_filter_(NULL),
       delegate_(delegate),
 #if defined(OS_CHROMEOS)
-      output_configurator_(new chromeos::OutputConfigurator()),
+      output_configurator_(new chromeos::OutputConfigurator(
+          internal::DisplayController::IsExtendedDesktopEnabled())),
 #endif  // defined(OS_CHROMEOS)
       shelf_(NULL),
       panel_layout_manager_(NULL),
       status_area_widget_(NULL),
       browser_context_(NULL) {
   gfx::Screen::SetInstance(screen_);
   ui_controls::InstallUIControlsAura(internal::CreateUIControls());
 #if defined(OS_CHROMEOS)
   // OutputConfigurator needs to get events regarding added/removed outputs.
   static_cast<aura::DispatcherLinux*>(
@@ skipping 588 matching lines @@
 }
 
 void Shell::ShowCursor(bool visible) {
   RootWindowList root_windows = GetAllRootWindows();
   for (RootWindowList::iterator iter = root_windows.begin();
        iter != root_windows.end(); ++iter)
     (*iter)->ShowCursor(visible);
 }
 
 }  // namespace ash