Whitelist virtual keyboard container to process events at login screen

ash/test/test_shell_delegate.cc

Index: ash/test/test_shell_delegate.cc
diff --git a/ash/test/test_shell_delegate.cc b/ash/test/test_shell_delegate.cc
index 532876ec851a7f44b5202adac74ca45a65f1aea7..665740cabbb07553f3bf794088bc73b246816c45 100644
--- a/ash/test/test_shell_delegate.cc
+++ b/ash/test/test_shell_delegate.cc
@@ -10,6 +10,7 @@
 #include "ash/host/root_window_host_factory.h"
 #include "ash/session_state_delegate.h"
 #include "ash/shell.h"
+#include "ash/shell/keyboard_controller_proxy_stub.h"
 #include "ash/shell_window_ids.h"
 #include "ash/test/test_launcher_delegate.h"
 #include "ash/test/test_session_state_delegate.h"
@@ -86,7 +87,7 @@ void TestShellDelegate::ShowKeyboardOverlay() {
 
 keyboard::KeyboardControllerProxy*
     TestShellDelegate::CreateKeyboardControllerProxy() {
-  return NULL;
+  return new KeyboardControllerProxyStub();
 }
 
 void TestShellDelegate::ShowTaskManager() {