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diff --git a/chromium/third_party/blink/renderer/platform/wtf/text/text_codec_icu.h b/chromium/third_party/blink/renderer/platform/wtf/text/text_codec_icu.h
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index 00000000000..64c3715750a
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+++ b/chromium/third_party/blink/renderer/platform/wtf/text/text_codec_icu.h
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2004, 2006, 2007, 2011 Apple Inc. All rights reserved.
+ * Copyright (C) 2006 Alexey Proskuryakov <ap@nypop.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_TEXT_CODEC_ICU_H_
+#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_TEXT_CODEC_ICU_H_
+
+#include <unicode/utypes.h>
+#include <memory>
+#include "base/gtest_prod_util.h"
+#include "base/macros.h"
+#include "third_party/blink/renderer/platform/wtf/text/text_codec.h"
+#include "third_party/blink/renderer/platform/wtf/text/text_encoding.h"
+
+typedef struct UConverter UConverter;
+
+namespace WTF {
+
+class TextCodecInput;
+
+class TextCodecICU final : public TextCodec {
+ public:
+  static void RegisterEncodingNames(EncodingNameRegistrar);
+  static void RegisterCodecs(TextCodecRegistrar);
+
+  ~TextCodecICU() override;
+
+ private:
+  TextCodecICU(const TextEncoding&);
+  WTF_EXPORT static std::unique_ptr<TextCodec> Create(const TextEncoding&,
+                                                      const void*);
+
+  String Decode(const char*,
+                size_t length,
+                FlushBehavior,
+                bool stop_on_error,
+                bool& saw_error) override;
+  CString Encode(const UChar*, size_t length, UnencodableHandling) override;
+  CString Encode(const LChar*, size_t length, UnencodableHandling) override;
+
+  template <typename CharType>
+  CString EncodeCommon(const CharType*, size_t length, UnencodableHandling);
+  CString EncodeInternal(const TextCodecInput&, UnencodableHandling);
+
+  void CreateICUConverter() const;
+  void ReleaseICUConverter() const;
+
+  int DecodeToBuffer(UChar* buffer,
+                     UChar* buffer_limit,
+                     const char*& source,
+                     const char* source_limit,
+                     int32_t* offsets,
+                     bool flush,
+                     UErrorCode&);
+
+  TextEncoding encoding_;
+  mutable UConverter* converter_icu_ = nullptr;
+#if defined(USING_SYSTEM_ICU)
+  mutable bool needs_gbk_fallbacks_ = false;
+#endif
+
+  FRIEND_TEST_ALL_PREFIXES(TextCodecICUTest, IgnorableCodePoint);
+};
+
+struct ICUConverterWrapper {
+  USING_FAST_MALLOC(ICUConverterWrapper);
+
+ public:
+  ICUConverterWrapper() : converter(nullptr) {}
+  ~ICUConverterWrapper();
+
+  UConverter* converter;
+
+  DISALLOW_COPY_AND_ASSIGN(ICUConverterWrapper);
+};
+
+}  // namespace WTF
+
+#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_TEXT_CODEC_ICU_H_