Implement Encoding API

LayoutTests/fast/encoding/api/fatal-flag-expected.txt

Index: LayoutTests/fast/encoding/api/fatal-flag-expected.txt
diff --git a/LayoutTests/fast/encoding/api/fatal-flag-expected.txt b/LayoutTests/fast/encoding/api/fatal-flag-expected.txt
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index 0000000000000000000000000000000000000000..f3478dfe2ad2a9526d51338d3bc1ae4e6b0b5438
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+++ b/LayoutTests/fast/encoding/api/fatal-flag-expected.txt
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+Test the Encoding API's 'fatal' flag
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS new TextDecoder('utf-8', {fatal: true}).decode(new Uint8Array([0xC0])) threw exception EncodingError: The encoded data was not valid..
+PASS new TextDecoder('utf-8', {fatal: true}).decode(new Uint8Array([0xC0, 0x00])) threw exception EncodingError: The encoded data was not valid..
+PASS new TextDecoder('utf-8', {fatal: true}).decode(new Uint8Array([0xC0, 0xC0])) threw exception EncodingError: The encoded data was not valid..
+PASS new TextDecoder('utf-8', {fatal: true}).decode(new Uint8Array([0xE0])) threw exception EncodingError: The encoded data was not valid..
+PASS new TextDecoder('utf-8', {fatal: true}).decode(new Uint8Array([0xE0, 0x00])) threw exception EncodingError: The encoded data was not valid..
+PASS new TextDecoder('utf-8', {fatal: true}).decode(new Uint8Array([0xE0, 0xC0])) threw exception EncodingError: The encoded data was not valid..
+PASS new TextDecoder('utf-8', {fatal: true}).decode(new Uint8Array([0xE0, 0x80, 0x00])) threw exception EncodingError: The encoded data was not valid..
+PASS new TextDecoder('utf-8', {fatal: true}).decode(new Uint8Array([0xE0, 0x80, 0xC0])) threw exception EncodingError: The encoded data was not valid..
+PASS new TextDecoder('utf-8', {fatal: true}).decode(new Uint8Array([0xFC, 0x80, 0x80, 0x80, 0x80, 0x80])) threw exception EncodingError: The encoded data was not valid..
+FAIL new TextDecoder('utf-16', {fatal: true}).decode(new Uint8Array([0x00])) should throw an exception. Was .
+FAIL new TextDecoder('utf-16', {fatal: true}).decode(new Uint8Array([0x00, 0xd8])) should throw an exception. Was ���.
+FAIL new TextDecoder('utf-16', {fatal: true}).decode(new Uint8Array([0x00, 0xd8, 0x00, 0x00])) should throw an exception. Was ���\0.
+FAIL new TextDecoder('utf-16', {fatal: true}).decode(new Uint8Array([0x00, 0xdc, 0x00, 0x00])) should throw an exception. Was ���\0.
+FAIL new TextDecoder('utf-16', {fatal: true}).decode(new Uint8Array([0x00, 0xdc, 0x00, 0xd8])) should throw an exception. Was ������.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+