Upstream iOS web code.

ios/web/public/string_util.h

Index: ios/web/public/string_util.h
diff --git a/ios/web/public/string_util.h b/ios/web/public/string_util.h
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index 0000000000000000000000000000000000000000..b5b23b3897442fb86ad54c6fbdf04520f9437c25
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+++ b/ios/web/public/string_util.h
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+// Copyright 2014 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 IOS_WEB_PUBLIC_STRING_UTIL_H_
+#define IOS_WEB_PUBLIC_STRING_UTIL_H_
+
+#include "base/strings/string16.h"
+
+namespace web {
+
+// Truncates |contents| to |length|.
+// Returns a string terminated at the last space to ensure no words are
+// clipped.
+// Note: This function uses spaces as word boundaries and may not handle all
+// languages correctly.
+base::string16 GetStringByClippingLastWord(const base::string16& contents,
+                                           size_t length);
+
+}  // namespace web
+
+#endif  // IOS_WEB_PUBLIC_STRING_UTIL_H_