Encoding API: Use 'windows-1252' as name for 'us-ascii' 'iso-8859-1'

LayoutTests/fast/encoding/api/latin-1-expected.txt

Index: LayoutTests/fast/encoding/api/latin-1-expected.txt
diff --git a/LayoutTests/fast/encoding/api/latin-1-expected.txt b/LayoutTests/fast/encoding/api/latin-1-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d689036b2c1ffe9d852ad1e2e9e7a4c921092333
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+++ b/LayoutTests/fast/encoding/api/latin-1-expected.txt
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+Verify that Latin-1 decoders (windows-1252, iso-8859-1, us-ascii, etc) decode identically.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+array = new Uint8Array(256)
+initialize array to 0...255
+windows1252 = new TextDecoder('windows-1252')
+decoder = new TextDecoder("ansi_x3.4-1968")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("ascii")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("cp1252")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("cp819")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("csisolatin1")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("ibm819")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("iso-8859-1")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("iso-ir-100")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("iso8859-1")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("iso88591")
+FAIL decoder = new TextDecoder("iso88591") threw exception TypeError: Type error
+decoder = new TextDecoder("iso_8859-1")
+FAIL decoder = new TextDecoder("iso_8859-1") threw exception TypeError: Type error
+decoder = new TextDecoder("iso_8859-1:1987")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("l1")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("latin1")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("us-ascii")
+PASS decoder.decode(array) is windows1252.decode(array)
+decoder = new TextDecoder("x-cp1252")
+FAIL decoder = new TextDecoder("x-cp1252") threw exception TypeError: Type error
+PASS successfullyParsed is true
+
+TEST COMPLETE
+B