Fix white virtual keyboard at login screen

ui/keyboard/keyboard_controller.cc

 // Copyright (c) 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 "ui/keyboard/keyboard_controller.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
@@ skipping 269 matching lines @@
   ShowKeyboardInternal();
 }
 
 void KeyboardController::OnWindowHierarchyChanged(
     const HierarchyChangeParams& params) {
   if (params.new_parent && params.target == container_.get())
     OnTextInputStateChanged(proxy_->GetInputMethod()->GetTextInputClient());
 }
 
 void KeyboardController::Reload() {
-  // Makes sure the keyboard window is initialized.
-  proxy_->GetKeyboardWindow();
-  proxy_->ReloadKeyboardIfNeeded();
+  if (proxy_->HasKeyboardWindow())
+    proxy_->ReloadKeyboardIfNeeded();
 }
 
 void KeyboardController::OnTextInputStateChanged(
     const ui::TextInputClient* client) {
   if (!container_.get())
     return;
 
   if (IsKeyboardUsabilityExperimentEnabled()) {
     ShowKeyboardInternal();
     return;
@@ skipping 116 matching lines @@
   // background during animation.
   NotifyKeyboardBoundsChanging(proxy_->GetKeyboardWindow()->bounds());
   proxy_->EnsureCaretInWorkArea();
 }
 
 void KeyboardController::HideAnimationFinished() {
   proxy_->HideKeyboardContainer(container_.get());
 }
 
 }  // namespace keyboard