Add spellcheck and word suggestion to the prediction service

services/prediction/proximity_info_factory.h

+// 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_PROXIMITY_INFO_FACTORY_H_
+#define SERVICES_PREDICTION_PROXIMITY_INFO_FACTORY_H_
+
+#include "mojo/services/prediction/public/interfaces/prediction.mojom.h"
+#include "services/prediction/key_set.h"
+#include "third_party/android_prediction/suggest/core/layout/proximity_info.h"
+
+// NOTE: This class has been translated to C++ and modified from the Android
+// Open Source Project. Specifically from some functions of the following file:
+// https://android.googlesource.com/platform/packages/inputmethods/LatinIME/+/
+// android-5.1.1_r8/java/src/com/android/inputmethod/keyboard/ProximityInfo.java
+
+namespace prediction {
+
+class ProximityInfoFactory {
+ public:
+  ProximityInfoFactory();
+  ~ProximityInfoFactory();
+
+  latinime::ProximityInfo* GetNativeProximityInfo();
+
+ private:
+  // Number of key widths from current touch point to search for nearest keys.
+  static const float SEARCH_DISTANCE;
+  static const float DEFAULT_TOUCH_POSITION_CORRECTION_RADIUS;
+
+  int SquaredDistanceToEdge(int x, int y, Key k);
+
+  int pgrid_width_;
+  int pgrid_height_;
+  int pgrid_size_;
+  int pcell_width_;
+  int pcell_height_;
+  int pkeyboard_min_width_;
+  int pkeyboard_height_;
+  int pmost_common_key_width_;
+  int pmost_common_key_height_;
+  std::string plocale_;
+};  // class ProximityInfoFactory
+
+}  // namespace prediction
+
+#endif  // SERVICES_PREDICTION_PROXIMITY_INFO_FACTORY_H_