[WIP][DO NOT LAND] Componentize spellcheck

chrome/renderer/spellchecker/spelling_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_SPELLING_ENGINE_H_
-#define CHROME_RENDERER_SPELLCHECKER_SPELLING_ENGINE_H_
-
-#include <string>
-#include <vector>
-
-#include "base/files/file.h"
-#include "base/strings/string16.h"
-
-// Creates the platform's "native" spelling engine.
-class SpellingEngine* CreateNativeSpellingEngine();
-
-// Interface to different spelling engines.
-class SpellingEngine {
- public:
-  virtual ~SpellingEngine() {}
-
-  // Initialize spelling engine with browser-side info. Must be called before
-  // any other functions are called.
-  virtual void Init(base::File bdict_file) = 0;
-  virtual bool InitializeIfNeeded() = 0;
-  virtual bool IsEnabled() = 0;
-  virtual bool CheckSpelling(const base::string16& word_to_check, int tag) = 0;
-  virtual void FillSuggestionList(
-      const base::string16& wrong_word,
-      std::vector<base::string16>* optional_suggestions) = 0;
-};
-
-#endif  // CHROME_RENDERER_SPELLCHECKER_SPELLING_ENGINE_H_
-