[WIP][DO NOT LAND] Componentize spellcheck

chrome/renderer/spellchecker/hunspell_engine.h

-// Copyright (c) 2012 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 CHROME_RENDERER_SPELLCHECKER_HUNSPELL_ENGINE_H_
-#define CHROME_RENDERER_SPELLCHECKER_HUNSPELL_ENGINE_H_
-
-#include <memory>
-#include <string>
-#include <vector>
-
-#include "base/strings/string16.h"
-#include "base/strings/utf_string_conversions.h"
-#include "chrome/common/spellcheck_common.h"
-#include "chrome/renderer/spellchecker/spelling_engine.h"
-
-class Hunspell;
-
-namespace base {
-class MemoryMappedFile;
-}
-
-class HunspellEngine : public SpellingEngine {
- public:
-  HunspellEngine();
-  ~HunspellEngine() override;
-
-  void Init(base::File file) override;
-
-  bool InitializeIfNeeded() override;
-  bool IsEnabled() override;
-  bool CheckSpelling(const base::string16& word_to_check, int tag) override;
-  void FillSuggestionList(
-      const base::string16& wrong_word,
-      std::vector<base::string16>* optional_suggestions) override;
-
- private:
-  // Initializes the Hunspell dictionary, or does nothing if |hunspell_| is
-  // non-null. This blocks.
-  void InitializeHunspell();
-
-  // We memory-map the BDict file.
-  std::unique_ptr<base::MemoryMappedFile> bdict_file_;
-
-  // The hunspell dictionary in use.
-  std::unique_ptr<Hunspell> hunspell_;
-
-  base::File file_;
-
-  // This flag is true if hunspell is enabled.
-  bool hunspell_enabled_;
-
-  // This flag is true if we have been initialized.
-  // The value indicates whether we should request a
-  // dictionary from the browser when the render view asks us to check the
-  // spelling of a word.
-  bool initialized_;
-
-  // This flag is true if we have requested dictionary.
-  bool dictionary_requested_;
-};
-
-#endif  // CHROME_RENDERER_SPELLCHECKER_HUNSPELL_ENGINE_H_