Add a full screen virtual keyboard to virtual keyboard root window

ash/display/display_controller.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_controller.h"
 
 #include <algorithm>
 #include <cmath>
 #include <map>
 
@@ skipping 321 matching lines @@
         internal::GetRootWindowController(root_window);
     if (controller) {
       controller->CloseChildWindows();
     } else {
       while (!root_window->children().empty()) {
         aura::Window* child = root_window->children()[0];
         delete child;
       }
     }
   }
+  if (virtual_keyboard_window_controller_ &&
+      virtual_keyboard_window_controller_->root_window_controller()) {
+    virtual_keyboard_window_controller_->root_window_controller()->
+        CloseChildWindows();
+  }
 }
 
 aura::Window::Windows DisplayController::GetAllRootWindows() {
   aura::Window::Windows windows;
   for (std::map<int64, aura::Window*>::const_iterator it =
            root_windows_.begin(); it != root_windows_.end(); ++it) {
     DCHECK(it->second);
     if (internal::GetRootWindowController(it->second))
       windows.push_back(it->second);
   }
@@ skipping 447 matching lines @@
     std::string name =
         root_windows[i] == primary ? "aura_root_0" : "aura_root_x";
     gfx::AcceleratedWidget xwindow =
         root_windows[i]->GetDispatcher()->GetAcceleratedWidget();
     XStoreName(gfx::GetXDisplay(), xwindow, name.c_str());
   }
 #endif
 }
 
 }  // namespace ash