FormData should not drop ignorable code points.

third_party/WebKit/Source/wtf/text/TextCodecICUTest.cpp

+// Copyright 2016 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.
+
+#include "wtf/text/TextCodecICU.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "wtf/text/CharacterNames.h"
+
+namespace WTF {
+
+TEST(TextCodecICUTest, IgnorableCodePoint)
+{
+    TextEncoding iso2022jp("iso-2022-jp");
+    std::unique_ptr<TextCodec> codec = TextCodecICU::create(iso2022jp, nullptr);
+    Vector<UChar> source;
+    source.append('a');
+    source.append(zeroWidthJoinerCharacter);
+    CString encoded = codec->encode(source.data(), source.size(), EntitiesForUnencodables);
+    EXPECT_STREQ("a&#8205;", encoded.data());
+}
+
+}