Implement Encoding API

LayoutTests/fast/encoding/api/encoding-names-expected.txt

Index: LayoutTests/fast/encoding/api/encoding-names-expected.txt
diff --git a/LayoutTests/fast/encoding/api/encoding-names-expected.txt b/LayoutTests/fast/encoding/api/encoding-names-expected.txt
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+Test the Encoding API's use of encoding names
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Encoding names are case insensitive
+PASS new TextDecoder('utf-8').encoding is "utf-8"
+PASS new TextDecoder('UTF-8').encoding is "utf-8"
+FAIL new TextDecoder('utf-16').encoding should be utf-16. Was utf-16le.
+FAIL new TextDecoder('UTF-16').encoding should be utf-16. Was utf-16le.
+FAIL new TextDecoder('utf-16le').encoding should be utf-16. Was utf-16le.
+FAIL new TextDecoder('UTF-16LE').encoding should be utf-16. Was utf-16le.
+PASS new TextDecoder('utf-16be').encoding is "utf-16be"
+PASS new TextDecoder('UTF-16BE').encoding is "utf-16be"
+FAIL new TextDecoder('ascii').encoding should be windows-1252. Was us-ascii.
+FAIL new TextDecoder('ASCII').encoding should be windows-1252. Was us-ascii.
+FAIL new TextDecoder('iso-8859-1').encoding should be windows-1252. Was iso-8859-1.
+FAIL new TextDecoder('ISO-8859-1').encoding should be windows-1252. Was iso-8859-1.
+PASS new TextDecoder('utf-8').encoding is "utf-8"
+FAIL new TextDecoder('UTF-16').encoding should be utf-16. Was utf-16le.
+PASS new TextDecoder('UTF-16BE').encoding is "utf-16be"
+FAIL new TextDecoder('iso8859-1').encoding should be windows-1252. Was iso-8859-1.
+FAIL new TextDecoder('iso-8859-1').encoding should be windows-1252. Was iso-8859-1.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+