Sync user's custom spellcheck dictionary

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/platform_file.h"
 #include "base/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::PlatformFile bdict_file,
                     const std::vector<std::string>& custom_words) = 0;
   virtual bool InitializeIfNeeded() = 0;
   virtual bool IsEnabled() = 0;
   virtual bool CheckSpelling(const string16& word_to_check, int tag) = 0;
-  virtual void FillSuggestionList(const string16& wrong_word,
-                          std::vector<string16>* optional_suggestions) = 0;
-  virtual void OnWordAdded(const std::string& word) = 0;
-  virtual void OnWordRemoved(const std::string& word) = 0;
+  virtual void FillSuggestionList(
+      const string16& wrong_word,
+      std::vector<string16>* optional_suggestions) = 0;
+  virtual void OnCustomDictionaryChanged(
+      const std::vector<std::string>& words_added,
+      const std::vector<std::string>& words_removed) = 0;
 };
 
 #endif  // CHROME_RENDERER_SPELLCHECKER_SPELLING_ENGINE_H_