Extract content dependency from keyboard code

ui/keyboard/keyboard_ui.cc

+// Copyright 2015 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_ui.h"
+
+#include "ui/aura/window.h"
+#include "ui/base/ime/input_method.h"
+#include "ui/base/ime/text_input_client.h"
+#include "ui/keyboard/keyboard_controller.h"
+
+namespace keyboard {
+
+KeyboardUI::KeyboardUI() : keyboard_controller_(nullptr) {}
+KeyboardUI::~KeyboardUI() {}
+
+void KeyboardUI::ShowKeyboardContainer(aura::Window* container) {
+  if (HasKeyboardWindow()) {
+    GetKeyboardWindow()->Show();
+    container->Show();
+  }
+}
+
+void KeyboardUI::HideKeyboardContainer(aura::Window* container) {
+  if (HasKeyboardWindow()) {
+    container->Hide();
+    GetKeyboardWindow()->Hide();
+  }
+}
+
+void KeyboardUI::EnsureCaretInWorkArea() {
+  if (GetInputMethod()->GetTextInputClient()) {
+    aura::Window* keyboard_window = GetKeyboardWindow();
+    aura::Window* root_window = keyboard_window->GetRootWindow();
+    gfx::Rect available_bounds = root_window->bounds();
+    gfx::Rect keyboard_bounds = keyboard_window->bounds();
+    available_bounds.set_height(available_bounds.height() -
+        keyboard_bounds.height());
+    GetInputMethod()->GetTextInputClient()->EnsureCaretInRect(available_bounds);
+  }
+}
+
+void KeyboardUI::SetController(KeyboardController* controller) {
+  keyboard_controller_ = controller;
+}
+
+}  // namespace keyboard