Add spellcheck and word suggestion to the prediction service

services/prediction/touch_position_correction.cc

+// 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.
+
+#include "services/prediction/touch_position_correction.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/internal/
+// TouchPositionCorrection.java
+
+namespace prediction {
+
+const int TouchPositionCorrection::TOUCH_POSITION_CORRECTION_RECORD_SIZE = 3;
+
+TouchPositionCorrection::TouchPositionCorrection() {
+  // value currently used by Android TouchPositionCorrection
+  std::string data[9] = {"0.0038756",
+                         "-0.0005677",
+                         "0.1577026",
+                         "-0.0236678",
+                         "0.0381731",
+                         "0.1529972",
+                         "-0.0086827",
+                         "0.0880847",
+                         "0.1522819"};
+  const int data_length = 9;
+  if (data_length % TOUCH_POSITION_CORRECTION_RECORD_SIZE != 0) {
+    return;
+  }
+
+  for (int i = 0; i < data_length; ++i) {
+    const int type = i % TOUCH_POSITION_CORRECTION_RECORD_SIZE;
+    const int index = i / TOUCH_POSITION_CORRECTION_RECORD_SIZE;
+    const float value = std::stof(data[i]);
+    if (type == 0) {
+      xs_[index] = value;
+    } else if (type == 1) {
+      ys_[index] = value;
+    } else {
+      radii_[index] = value;
+    }
+  }
+  enabled_ = data_length > 0;
+}
+
+TouchPositionCorrection::~TouchPositionCorrection() {
+}
+
+bool TouchPositionCorrection::IsValid() {
+  return enabled_;
+}
+
+int TouchPositionCorrection::GetRows() {
+  return 3;
+}
+
+float TouchPositionCorrection::GetX(const int row) {
+  // Touch position correction data for X coordinate is obsolete.
+  return 0.0f;
+}
+
+float TouchPositionCorrection::GetY(const int row) {
+  return ys_[row];
+}
+
+float TouchPositionCorrection::GetRadius(const int row) {
+  return radii_[row];
+}
+
+}  // namespace prediction