Implement "replacement" text encoding.

Source/wtf/text/TextEncodingRegistry.cpp

Index: Source/wtf/text/TextEncodingRegistry.cpp
diff --git a/Source/wtf/text/TextEncodingRegistry.cpp b/Source/wtf/text/TextEncodingRegistry.cpp
index 7f241343fc7c841ff2f7e3611a93822967d23941..4bbf81b1e99f9a9f7a7b9c673ff7c1e08868d5c8 100644
--- a/Source/wtf/text/TextEncodingRegistry.cpp
+++ b/Source/wtf/text/TextEncodingRegistry.cpp
@@ -38,6 +38,7 @@
 #include "wtf/text/CString.h"
 #include "wtf/text/TextCodecICU.h"
 #include "wtf/text/TextCodecLatin1.h"
+#include "wtf/text/TextCodecReplacement.h"
 #include "wtf/text/TextCodecUTF16.h"
 #include "wtf/text/TextCodecUTF8.h"
 #include "wtf/text/TextCodecUserDefined.h"
@@ -275,6 +276,9 @@ bool shouldShowBackslashAsCurrencySymbolIn(const char* canonicalEncodingName)
 
 static void extendTextCodecMaps()
 {
+    TextCodecReplacement::registerEncodingNames(addToTextEncodingNameMap);
+    TextCodecReplacement::registerCodecs(addToTextCodecMap);
+
     TextCodecICU::registerEncodingNames(addToTextEncodingNameMap);
     TextCodecICU::registerCodecs(addToTextCodecMap);