Add spellcheck and word suggestion to the prediction service

services/prediction/dictionary_service.h

Index: services/prediction/dictionary_service.h
diff --git a/services/prediction/dictionary_service.h b/services/prediction/dictionary_service.h
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+++ b/services/prediction/dictionary_service.h
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+// Copyright 2015 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 SERVICES_PREDICTION_DICTIONARY_SERVICE_H_
+#define SERVICES_PREDICTION_DICTIONARY_SERVICE_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "mojo/services/prediction/public/interfaces/prediction.mojom.h"
+#include "services/prediction/proximity_info_factory.h"
+
+namespace latinime {
+
+class Dictionary;
+class DicTraverseSession;
+class PrevWordsInfo;
+}  // namespace latinime
+
+namespace prediction {
+
+class DictionaryService {
+ public:
+  DictionaryService();
+  ~DictionaryService();
+
+  mojo::Array<mojo::String> GetDictionarySuggestion(
+      PredictionInfoPtr prediction_info,
+      latinime::ProximityInfo* proximity_info);
+
+ private:
+  void CreatDictFromEmbeddedDataIfNotExist(const std::string path);
+
+  latinime::Dictionary* const OpenDictionary(const std::string path,
+                                             const int start_offset,
+                                             const int size,
+                                             const bool is_updatable);
+
+  latinime::PrevWordsInfo ProcessPrevWord(
+      mojo::Array<PrevWordInfoPtr>& prev_words);
+
+  int max_suggestion_size_;
+  scoped_ptr<latinime::Dictionary> default_dictionary_;
+  scoped_ptr<latinime::DicTraverseSession> default_session_;
+
+  DISALLOW_COPY_AND_ASSIGN(DictionaryService);
+};
+
+}  // namespace prediction
+
+#endif  // SERVICES_PREDICTION_DICTIONARY_SERVICE_H_