Add spellcheck and word suggestion to the prediction service

services/keyboard_native/text_update_key.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_KEYBOARD_NATIVE_TEXT_UPDATE_KEY_H_
+#define SERVICES_KEYBOARD_NATIVE_TEXT_UPDATE_KEY_H_
+
+#include <string>
+
+#include "base/callback.h"
+#include "services/keyboard_native/key_layout.h"
+
+class SkCanvas;
+class SkPaint;
+
+namespace gfx {
+class RectF;
+}
+
+namespace keyboard {
+class TextUpdateKey : public KeyLayout::Key {
+ public:
+  TextUpdateKey(std::string text,
+                base::Callback<void(const TextUpdateKey&)> touch_up_callback);
+
+  ~TextUpdateKey() override;
+
+  // Key implementation.
+  void Draw(SkCanvas* canvas,
+            const SkPaint& paint,
+            const gfx::RectF& rect) override;
+
+  const char* ToText() const override;
+
+  void OnTouchUp() override;
+
+  void ChangeText(std::string new_text);
+
+ private:
+  std::string text_;
+  base::Callback<void(const TextUpdateKey&)> touch_up_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(TextUpdateKey);
+};
+
+}  // namespace keyboard
+
+#endif  // SERVICES_KEYBOARD_NATIVE_TEXT_UPDATE_KEY_H_