Prepare Chromium and Blink for ICU 59

base/i18n/unicodestring.h

+// Copyright (c) 2017 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 BASE_I18N_UNICODESTRING_H_
+#define BASE_I18N_UNICODESTRING_H_
+
+#include "base/strings/string16.h"
+#include "third_party/icu/source/common/unicode/unistr.h"
+
+namespace base {
+namespace i18n {
+
+inline string16 UnicodeStringToString16(const icu::UnicodeString& unistr) {
+  return base::string16(reinterpret_cast<const char16*>(unistr.getBuffer()),
+                        static_cast<size_t>(unistr.length()));

[jungshik at Google, 2017/03/08 21:02:39]

Strictly speaking, the above reinterpret_cast has an undefined behavior.  I'll
use what Markus wrote for ICU (internal atm, but he'll make it public for ICU
clients to use) to avoid UB. 

+}
+
+}  // namespace i18n
+}  // namespace base
+
+#endif  // BASE_UNICODESTRING_H_