[WIP][DO NOT LAND] Componentize spellcheck

chrome/renderer/spellchecker/custom_dictionary_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_CUSTOM_DICTIONARY_ENGINE_H_
-#define CHROME_RENDERER_SPELLCHECKER_CUSTOM_DICTIONARY_ENGINE_H_
-
-#include <set>
-#include <string>
-
-#include "base/macros.h"
-#include "base/strings/string16.h"
-
-// Custom spellcheck dictionary. Words in this dictionary are always correctly
-// spelled. Words that are not in this dictionary may or may not be correctly
-// spelled.
-class CustomDictionaryEngine {
- public:
-  CustomDictionaryEngine();
-  ~CustomDictionaryEngine();
-
-  // Initialize the custom dictionary engine.
-  void Init(const std::set<std::string>& words);
-
-  // Spellcheck |text|. Assumes that another spelling engine has set
-  // |misspelling_start| and |misspelling_len| to indicate a misspelling.
-  // Returns true if there are no misspellings, otherwise returns false.
-  bool SpellCheckWord(const base::string16& text,
-                      int misspelling_start,
-                      int misspelling_len);
-
-  // Update custom dictionary words.
-  void OnCustomDictionaryChanged(const std::set<std::string>& words_added,
-                                 const std::set<std::string>& words_removed);
-
- private:
-  // Correctly spelled words.
-  std::set<base::string16> dictionary_;
-
-  DISALLOW_COPY_AND_ASSIGN(CustomDictionaryEngine);
-};
-
-#endif  // CHROME_RENDERER_SPELLCHECKER_CUSTOM_DICTIONARY_ENGINE_H_