Implement Encoding API

LayoutTests/fast/encoding/api/byte-order-marks-expected.txt

Index: LayoutTests/fast/encoding/api/byte-order-marks-expected.txt
diff --git a/LayoutTests/fast/encoding/api/byte-order-marks-expected.txt b/LayoutTests/fast/encoding/api/byte-order-marks-expected.txt
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+Test the Encoding API's handling of byte-order marks (BOMs).
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS new TextDecoder('utf-8').decode(new Uint8Array(utf8)) is "z¢水𝄞􏿽"
+PASS new TextDecoder('utf-16le').decode(new Uint8Array(utf16le)) is "z¢水𝄞􏿽"
+PASS new TextDecoder('utf-16be').decode(new Uint8Array(utf16be)) is "z¢水𝄞􏿽"
+FAIL new TextDecoder('utf-8').decode(new Uint8Array(utf8_bom.concat(utf8))) should be z¢水𝄞􏿽. Was z¢水𝄞􏿽.
+FAIL new TextDecoder('utf-16le').decode(new Uint8Array(utf16le_bom.concat(utf16le))) should be z¢水𝄞􏿽. Was z¢水𝄞􏿽.
+FAIL new TextDecoder('utf-16be').decode(new Uint8Array(utf16be_bom.concat(utf16be))) should be z¢水𝄞􏿽. Was z¢水𝄞􏿽.
+PASS new TextDecoder('utf-8').decode(new Uint8Array(utf16le_bom.concat(utf8))) is not "z¢水𝄞􏿽"
+PASS new TextDecoder('utf-8').decode(new Uint8Array(utf16be_bom.concat(utf8))) is not "z¢水𝄞􏿽"
+PASS new TextDecoder('utf-16le').decode(new Uint8Array(utf8_bom.concat(utf16le))) is not "z¢水𝄞􏿽"
+PASS new TextDecoder('utf-16le').decode(new Uint8Array(utf16be_bom.concat(utf16le))) is not "z¢水𝄞􏿽"
+PASS new TextDecoder('utf-16be').decode(new Uint8Array(utf8_bom.concat(utf16be))) is not "z¢水𝄞􏿽"
+PASS new TextDecoder('utf-16be').decode(new Uint8Array(utf16le_bom.concat(utf16be))) is not "z¢水𝄞􏿽"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+