Extract content dependency from keyboard code

ash/test/test_keyboard_ui.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/test/test_keyboard_ui.h"
+
+#include "ash/shell.h"
+#include "ash/shell_delegate.h"
+#include "ash/wm/window_util.h"
+#include "ui/aura/window.h"
+#include "ui/aura/window_tree_host.h"
+#include "ui/base/ime/mock_input_method.h"
+
+namespace ash {
+
+TestKeyboardUI::TestKeyboardUI() {}
+TestKeyboardUI::~TestKeyboardUI() {}
+
+bool TestKeyboardUI::HasKeyboardWindow() const {
+  return keyboard_;
+}
+
+aura::Window* TestKeyboardUI::GetKeyboardWindow() {
+  if (!keyboard_) {
+    keyboard_.reset(new aura::Window(&delegate_));
+    keyboard_->Init(ui::LAYER_NOT_DRAWN);
+  }
+  return keyboard_.get();
+}
+
+ui::InputMethod* TestKeyboardUI::GetInputMethod() {
+  aura::Window* active_window = wm::GetActiveWindow();
+  aura::Window* root_window = active_window ? active_window->GetRootWindow()
+                                            : Shell::GetPrimaryRootWindow();
+  return root_window->GetHost()->GetInputMethod();
+}
+
+}  // namespace ash