Add spellcheck and word suggestion to the prediction service

services/keyboard_native/predictor.h

Index: services/keyboard_native/predictor.h
diff --git a/services/keyboard_native/predictor.h b/services/keyboard_native/predictor.h
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+++ b/services/keyboard_native/predictor.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_KEYBOARD_NATIVE_PREDICTOR_H_
+#define SERVICES_KEYBOARD_NATIVE_PREDICTOR_H_
+
+#include <vector>
+
+#include "base/callback.h"
+#include "mojo/public/cpp/application/connect.h"
+#include "mojo/public/interfaces/application/shell.mojom.h"
+#include "mojo/services/prediction/public/interfaces/prediction.mojom.h"
+#include "services/keyboard_native/key_layout.h"
+
+namespace keyboard {
+
+class Predictor {
+ public:
+  Predictor(mojo::Shell* shell);
+  ~Predictor();
+
+  void SetSuggestionKeys(std::vector<KeyLayout::Key*> suggestion_keys);
+
+  void SetUpdateCallback(base::Callback<void()> on_update_callback);
+
+  void StoreCurWord(std::string new_word);
+
+  int ChooseSuggestedWord(std::string suggested);
+
+  void DeleteCharInCurWord();
+
+ private:
+  void ShowEmptySuggestion();
+
+  void GetSuggestion();
+
+  void GetPredictionListAndEnd(const mojo::Array<mojo::String>& input_list);
+
+  prediction::PredictionServicePtr prediction_service_impl_;
+  std::vector<KeyLayout::Key*> suggestion_keys_;
+  std::string current_word_;
+  std::vector<std::string> previous_words_;
+  base::Callback<void()> on_update_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(Predictor);
+};
+
+}  // namespace keyboard
+
+#endif  // SERVICES_KEYBOARD_NATIVE_PREDICTOR_H_