Added Base64 support in TextEncoder and TextDecoder.

Source/wtf/text/TextCodecBase64.h

Index: Source/wtf/text/TextCodecBase64.h
diff --git a/Source/wtf/text/TextCodecLatin1.h b/Source/wtf/text/TextCodecBase64.h
similarity index 85%
copy from Source/wtf/text/TextCodecLatin1.h
copy to Source/wtf/text/TextCodecBase64.h
index 7a0fa3715be1d585390105ffdc1b04344010adcd..1b2494b3e639084a020075eae999feb880d6998d 100644
--- a/Source/wtf/text/TextCodecLatin1.h
+++ b/Source/wtf/text/TextCodecBase64.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2004, 2006 Apple Computer, Inc.  All rights reserved.
+ * Copyright (C) 2011 Apple Inc. All rights reserved.

[jsbell, 2014/01/24 22:15:05]

New file, should use updated copyright/license. 

http://www.chromium.org/blink/coding-style

  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -23,27 +23,27 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef TextCodecLatin1_h
-#define TextCodecLatin1_h
+#ifndef TextCodecBase64_h
+#define TextCodecBase64_h
 
 #include "wtf/text/TextCodec.h"
 
 namespace WTF {
 
-class TextCodecLatin1 FINAL : public TextCodec {
+class TextCodecBase64 FINAL : public TextCodec {
 public:
     static void registerEncodingNames(EncodingNameRegistrar);
     static void registerCodecs(TextCodecRegistrar);
 
 private:
+    static PassOwnPtr<TextCodec> create(const TextEncoding&, const void*);
+    TextCodecBase64() { }
+
     virtual String decode(const char*, size_t length, bool flush, bool stopOnError, bool& sawError) OVERRIDE;
     virtual CString encode(const UChar*, size_t length, UnencodableHandling) OVERRIDE;
     virtual CString encode(const LChar*, size_t length, UnencodableHandling) OVERRIDE;
-
-    template<typename CharType>
-    CString encodeCommon(const CharType*, size_t length, UnencodableHandling);
 };
 
 } // namespace WTF
 
-#endif // TextCodecLatin1_h
+#endif // TextCodecBase64_h