Migrate more tests from blink repository.

test/webkit/fast/js/string-capitalization-expected.txt

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-Tests that regular expressions treat non-BMP characters as two separate characters. From a Unicode correctness point of view this is wrong, but it is what other browsers do. And given that we store strings as UTF-16, it is also more efficient to implement. Also test some other cases related to UTF-8 and UTF-16.
+This test checks that toLowerCase and toUpperCase handle certain non-trivial cases correctly.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS /./.exec(surrogatePair).toString().length is 1
-PASS /\D/.exec(surrogatePair).toString().length is 1
-PASS /\S/.exec(surrogatePair).toString().length is 1
-PASS /\W/.exec(surrogatePair).toString().length is 1
-PASS /[^x]/.exec(surrogatePair).toString().length is 1
-
-PASS /.{1,2}/.exec("!!" + String.fromCharCode(0xA1)).toString().length is 2
-PASS /./.exec("") is null
-
+FAIL String("A𐐀").toLowerCase() should be a𐐨. Was a𐐀.
+FAIL String("a𐐨").toUpperCase() should be A𐐀. Was A𐐨.
+PASS String("ΚΟΣΜΟΣ ΚΟΣΜΟΣ").toLowerCase() is "κοσμος κοσμος"
+PASS String("ß").toUpperCase() is "SS"
+PASS String("ʼn").toUpperCase() is "ʼN"
+PASS String("ǰ").toUpperCase() is "J̌"
+PASS String("ffi").toUpperCase() is "FFI"
+PASS String("FFI").toLowerCase() is "ffi"
+PASS String("IJ").toLowerCase() is "ij"
+PASS expected[String.fromCharCode(0xA78D).toLowerCase()] is true
+PASS expected[String.fromCharCode(0x0265).toUpperCase()] is true
+PASS expected[String.fromCharCode(0x10C7).toLowerCase()] is true
+PASS expected[String.fromCharCode(0x2D27).toUpperCase()] is true
+PASS expected[String.fromCharCode(0x2D2D).toLowerCase()] is true
+PASS expected[String.fromCharCode(0x10CD).toUpperCase()] is true
+PASS expected[String.fromCharCode(0x2CF2).toLowerCase()] is true
+PASS expected[String.fromCharCode(0x2CF3).toUpperCase()] is true
+PASS expected[String.fromCharCode(0xA792).toLowerCase()] is true
+PASS expected[String.fromCharCode(0xA793).toUpperCase()] is true
+PASS expected[String.fromCharCode(0xA7AA).toLowerCase()] is true
+PASS expected[String.fromCharCode(0x0266).toUpperCase()] is true
 PASS successfullyParsed is true
 
 TEST COMPLETE