Remove remote tree host and some related input and metro_driver code

ui/base/ime/remote_input_method_win.h

-// 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.
-
-#ifndef UI_BASE_IME_REMOTE_INPUT_METHOD_WIN_H_
-#define UI_BASE_IME_REMOTE_INPUT_METHOD_WIN_H_
-
-#include <Windows.h>
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/string16.h"
-#include "ui/base/ime/ui_base_ime_export.h"
-#include "ui/gfx/native_widget_types.h"
-
-namespace ui {
-namespace internal {
-class InputMethodDelegate;
-class RemoteInputMethodDelegateWin;
-}  // namespace internal
-
-class InputMethod;
-struct CompositionText;
-
-// RemoteInputMethodWin is a special implementation of ui::InputMethod that
-// works as a proxy of an IME handler running in the metro_driver process.
-// RemoteInputMethodWin works as follows.
-// - Any action to RemoteInputMethodWin should be delegated to the
-//   metro_driver process via RemoteInputMethodDelegateWin.
-// - Data retrieval from RemoteInputMethodPrivateWin is implemented with
-//   data cache. Whenever the IME state in the metro_driver process is changed,
-//   RemoteWindowTreeHostWin, which receives IPCs from metro_driver process,
-//   will call RemoteInputMethodPrivateWin::OnCandidatePopupChanged and/or
-//   RemoteInputMethodPrivateWin::OnInputSourceChanged accordingly so that
-//   the state cache should be updated.
-// - Some IPC messages that represent actions to TextInputClient should be
-//   delegated to RemoteInputMethodPrivateWin so that RemoteInputMethodWin can
-//   work as a real proxy.
-
-// Returns true if |widget| requires RemoteInputMethodWin.
-bool IsRemoteInputMethodWinRequired(gfx::AcceleratedWidget widget);
-
-// Returns the public interface of RemoteInputMethodWin.
-// Caveats: Currently only one instance of RemoteInputMethodWin is able to run
-// at the same time.
-UI_BASE_IME_EXPORT scoped_ptr<InputMethod> CreateRemoteInputMethodWin(
-    internal::InputMethodDelegate* delegate);
-
-// Private interface of RemoteInputMethodWin.
-class UI_BASE_IME_EXPORT RemoteInputMethodPrivateWin {
- public:
-  RemoteInputMethodPrivateWin();
-
-  // Returns the private interface of RemoteInputMethodWin when and only when
-  // |input_method| is instanciated via CreateRemoteInputMethodWin. Caller does
-  // not take the ownership of the returned object.
-  // As you might notice, this is yet another reinplementation of dynamic_cast
-  // or IUnknown::QueryInterface.
-  static RemoteInputMethodPrivateWin* Get(InputMethod* input_method);
-
-  // Installs RemoteInputMethodDelegateWin delegate. Set NULL to |delegate| to
-  // unregister.
-  virtual void SetRemoteDelegate(
-      internal::RemoteInputMethodDelegateWin* delegate) = 0;
-
-  // Updates internal cache so that subsequent calls of
-  // RemoteInputMethodWin::IsCandidatePopupOpen can return the correct value
-  // based on remote IME activities in the metro_driver process.
-  virtual void OnCandidatePopupChanged(bool visible) = 0;
-
-  // Updates internal cache so that subsequent calls of
-  // RemoteInputMethodWin::GetInputLocale can return the correct values based on
-  // remote IME activities in the metro_driver process.
-  virtual void OnInputSourceChanged(LANGID langid, bool is_ime) = 0;
-
-  // Handles composition-update events occurred in the metro_driver process.
-  // Caveats: This method is designed to be used only with
-  // metro_driver::TextService. In other words, there is no garantee that this
-  // method works a wrapper to call ui::TextInputClient::SetCompositionText.
-  virtual void OnCompositionChanged(
-      const CompositionText& composition_text) = 0;
-
-  // Handles text-commit events occurred in the metro_driver process.
-  // Caveats: This method is designed to be used only with
-  // metro_driver::TextService. In other words, there is no garantee that this
-  // method works a wrapper to call ui::TextInputClient::InsertText. In fact,
-  // this method may call ui::TextInputClient::InsertChar when the text input
-  // type of the focused text input client is TEXT_INPUT_TYPE_NONE.
-  virtual void OnTextCommitted(const base::string16& text) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(RemoteInputMethodPrivateWin);
-};
-
-}  // namespace ui
-
-#endif  // UI_BASE_IME_REMOTE_INPUT_METHOD_WIN_H_