Implement "replacement" text encoding.

Source/modules/encoding/TextDecoder.cpp

Index: Source/modules/encoding/TextDecoder.cpp
diff --git a/Source/modules/encoding/TextDecoder.cpp b/Source/modules/encoding/TextDecoder.cpp
index 06bf788e0f7aacde318748d8c796432d20bd9c67..db0be85569a0558e1b83857c5cb7b6340d6e2bd4 100644
--- a/Source/modules/encoding/TextDecoder.cpp
+++ b/Source/modules/encoding/TextDecoder.cpp
@@ -38,9 +38,9 @@
 
 namespace WebCore {
 
-PassRefPtr<TextDecoder> TextDecoder::create(const String& label, const Dictionary& options, ExceptionState& exceptionState)
+PassRefPtr<TextDecoder> TextDecoder::create(const String& utfLabel, const Dictionary& options, ExceptionState& exceptionState)
 {
-    const String& encodingLabel = label.isNull() ? String("utf-8") : label;
+    const String& encodingLabel = utfLabel.isNull() ? String("utf-8") : utfLabel;
 
     WTF::TextEncoding encoding(encodingLabel);
     if (!encoding.isValid()) {
@@ -51,13 +51,12 @@ PassRefPtr<TextDecoder> TextDecoder::create(const String& label, const Dictionar
     bool fatal = false;
     options.get("fatal", fatal);
 
-    return adoptRef(new TextDecoder(encoding.name(), fatal));
+    return adoptRef(new TextDecoder(encodingLabel, encoding.name(), fatal));
 }
 
-
-TextDecoder::TextDecoder(const String& encoding, bool fatal)
-    : m_encoding(encoding)
-    , m_codec(newTextCodec(m_encoding))
+TextDecoder::TextDecoder(const String& label, const String& name, bool fatal)
+    : m_encoding(name)
+    , m_codec(newTextCodec(label))
     , m_fatal(fatal)
     , m_bomSeen(false)
 {
@@ -69,7 +68,7 @@ TextDecoder::~TextDecoder()
 
 String TextDecoder::encoding() const
 {
-    String name = String(m_encoding.name()).lower();
+    String name = m_encoding.lower();
     // Where possible, encoding aliases should be handled by changes to Chromium's ICU or Blink's WTF.
     // The same codec is used, but WTF maintains a different name/identity for these.
     if (name == "iso-8859-1" || name == "us-ascii")
@@ -100,8 +99,7 @@ String TextDecoder::decode(ArrayBufferView* input, const Dictionary& options, Ex
 
     if (!m_bomSeen && !s.isEmpty()) {
         m_bomSeen = true;
-        String name(m_encoding.name());
-        if ((name == "UTF-8" || name == "UTF-16LE" || name == "UTF-16BE") && s[0] == 0xFEFF)
+        if ((m_encoding == "UTF-8" || m_encoding == "UTF-16LE" || m_encoding == "UTF-16BE") && s[0] == 0xFEFF)
             s.remove(0);
     }