Whitelist virtual keyboard container to process events at login screen

ash/test/test_shell_delegate.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/test/test_shell_delegate.h"
 
 #include <limits>
 
 #include "ash/caps_lock_delegate_stub.h"
 #include "ash/host/root_window_host_factory.h"
+#include "ash/keyboard_controller_proxy_stub.h"
 #include "ash/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/test/test_launcher_delegate.h"
 #include "ash/test/test_session_state_delegate.h"
 #include "ash/wm/window_util.h"
 #include "base/logging.h"
 #include "content/public/test/test_browser_context.h"
 #include "ui/aura/window.h"
 
@@ skipping 58 matching lines @@
 }
 
 void TestShellDelegate::RestoreTab() {
 }
 
 void TestShellDelegate::ShowKeyboardOverlay() {
 }
 
 keyboard::KeyboardControllerProxy*
     TestShellDelegate::CreateKeyboardControllerProxy() {
-  return NULL;
+  return new KeyboardControllerProxyStub();
 }
 
 void TestShellDelegate::ShowTaskManager() {
 }
 
 content::BrowserContext* TestShellDelegate::GetCurrentBrowserContext() {
   current_browser_context_.reset(new content::TestBrowserContext());
   return current_browser_context_.get();
 }
 
@@ skipping 109 matching lines @@
 base::string16 TestShellDelegate::GetProductName() const {
   return base::string16();
 }
 
 TestSessionStateDelegate* TestShellDelegate::test_session_state_delegate() {
   return test_session_state_delegate_;
 }
 
 }  // namespace test
 }  // namespace ash