[WIP][DO NOT LAND] Componentize spellcheck

chrome/renderer/spellchecker/custom_dictionary_engine.cc

-// 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.
-
-#include "chrome/renderer/spellchecker/custom_dictionary_engine.h"
-
-#include <stddef.h>
-
-#include "base/strings/utf_string_conversions.h"
-
-CustomDictionaryEngine::CustomDictionaryEngine() {
-}
-
-CustomDictionaryEngine::~CustomDictionaryEngine() {
-}
-
-void CustomDictionaryEngine::Init(const std::set<std::string>& custom_words) {
-  dictionary_.clear();
-
-  // SpellingMenuOberver calls UTF16ToUTF8(word) to convert words for storage,
-  // synchronization, and use in the custom dictionary engine. Since
-  // (UTF8ToUTF16(UTF16ToUTF8(word)) == word) holds, the engine does not need to
-  // normalize the strings.
-  for (const std::string& word : custom_words)
-    dictionary_.insert(base::UTF8ToUTF16(word));
-}
-
-void CustomDictionaryEngine::OnCustomDictionaryChanged(
-    const std::set<std::string>& words_added,
-    const std::set<std::string>& words_removed) {
-  for (const std::string& word : words_added)
-    dictionary_.insert(base::UTF8ToUTF16(word));
-
-  for (const std::string& word : words_removed)
-    dictionary_.erase(base::UTF8ToUTF16(word));
-}
-
-bool CustomDictionaryEngine::SpellCheckWord(
-    const base::string16& text,
-    int misspelling_start,
-    int misspelling_len) {
-  // The text to be checked is empty on OSX(async) right now.
-  // TODO(groby): Fix as part of async hook-up. (http://crbug.com/178241)
-  return
-      misspelling_start >= 0 &&
-      misspelling_len > 0 &&
-      size_t(misspelling_start + misspelling_len) <= text.length() &&
-      dictionary_.count(text.substr(misspelling_start, misspelling_len)) > 0;
-}