Revert "Remove spellcheck feedback."

chrome/browser/spellchecker/word_trimmer.h

+// Copyright (c) 2011 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 CHROME_BROWSER_SPELLCHECKER_WORD_TRIMMER_H_
+#define CHROME_BROWSER_SPELLCHECKER_WORD_TRIMMER_H_
+
+#include "base/strings/string16.h"
+
+// Trims |text| to contain only the range from |start| to |end| and |keep| words
+// on either side of the range. The |start| and |end| parameters are character
+// indexes into |text|. The |keep| parameter is the number of words to keep on
+// either side of the |start|-|end| range. The function updates |start| in
+// accordance with the trimming.
+//
+// Example:
+//
+//  size_t start = 14;
+//  size_t end = 23;
+//  base::string16 text =
+//      base::ASCIIToUTF16("one two three four five six seven eight");
+//  int keep = 2;
+//  base::string16 trimmed = TrimWords(&start, end, text, keep);
+//  DCHECK(trimmed == base::ASCIIToUTF16("two three four five six seven"));
+//  DCHECK(start == 10);
+//
+base::string16 TrimWords(size_t* start,
+                         size_t end,
+                         const base::string16& text,
+                         size_t keep);
+
+#endif  // CHROME_BROWSER_SPELLCHECKER_WORD_TRIMMER_H_