Add a container window to host the desktop window hierarchy in AURA.

ui/views/widget/desktop_aura/desktop_root_window_host_x11.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/widget/desktop_aura/desktop_root_window_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 907 matching lines @@
 
   native_widget_delegate_->OnNativeWidgetCreated(true);
 
   desktop_native_widget_aura_->CreateCaptureClient(root_window_);
 
   // Ensure that the X11DesktopHandler exists so that it dispatches activation
   // messages to us.
   X11DesktopHandler::get();
 
   corewm::FocusController* focus_controller =
-      new corewm::FocusController(new DesktopFocusRules);
+      new corewm::FocusController(new DesktopFocusRules(content_window_));
   focus_client_.reset(focus_controller);
   aura::client::SetFocusClient(root_window_, focus_controller);
   aura::client::SetActivationClient(root_window_, focus_controller);
   root_window_->AddPreTargetHandler(focus_controller);
 
   dispatcher_client_.reset(new DesktopDispatcherClient);
   aura::client::SetDispatcherClient(root_window_,
                                     dispatcher_client_.get());
 
   views::DesktopNativeCursorManager* desktop_native_cursor_manager =
@@ skipping 420 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme();
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views