Add a full screen virtual keyboard to virtual keyboard root window

ash/display/virtual_keyboard_window_controller.cc

 // Copyright 2013 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/virtual_keyboard_window_controller.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/display_info.h"
 #include "ash/display/display_manager.h"
 #include "ash/host/root_window_host_factory.h"
@@ skipping 33 matching lines @@
 
     // No need to remove RootWindowObserver because
     // the DisplayController object outlives RootWindow objects.
     root_window->AddRootWindowObserver(
         Shell::GetInstance()->display_controller());
     InitRootWindowSettings(root_window)->display_id = display_info.id();
     root_window->Init();
     RootWindowController::CreateForVirtualKeyboardDisplay(root_window);
     root_window_controller_.reset(GetRootWindowController(root_window));
     root_window_controller_->root_window()->ShowRootWindow();
+    root_window_controller_->ActivateKeyboard(
+        Shell::GetInstance()->keyboard_controller());
   } else {
     aura::RootWindow* root_window = root_window_controller_->root_window();
     GetRootWindowSettings(root_window)->display_id = display_info.id();
     root_window->SetHostBounds(display_info.bounds_in_native());
   }
 }
 
 void VirtualKeyboardWindowController::Close() {
   if (root_window_controller_.get()) {
     root_window_controller_->root_window()->RemoveRootWindowObserver(
         Shell::GetInstance()->display_controller());
     root_window_controller_->Shutdown();
     root_window_controller_.reset();
   }
 }
 
 }  // namespace internal
 }  // namespace ash