[webcrypto] Import WebKit's webcrypto tests.

LayoutTests/crypto/aes-export-key-expected.txt

Index: LayoutTests/crypto/aes-export-key-expected.txt
diff --git a/LayoutTests/crypto/aes-export-key-expected.txt b/LayoutTests/crypto/aes-export-key-expected.txt
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+Test exporting an AES key.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+error is: TypeError: Failed to execute 'exportKey' on 'SubtleCrypto': 2 arguments required, but only 1 present.
+error is: DataError: Invalid key argument
+error is: DataError: Invalid key argument
+error is: DataError: Invalid key argument
+error is: DataError: Invalid key argument
+
+Importing a JWK key...
+error is: SyntaxError: Invalid keyFormat argument
+error is: SyntaxError: Invalid keyFormat argument
+error is: SyntaxError: Invalid keyFormat argument
+error is: SyntaxError: Invalid keyFormat argument
+error is: SyntaxError: Invalid keyFormat argument
+
+Exporting the key as raw data...
+PASS bytesToHexString(new Uint8Array(exportedData)) is '8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b'
+Exporting the key as JWK...
+PASS exportedJWK.kty is 'oct'
+PASS exportedJWK.k is 'jnOw99oOZFLIEPMrgJB55WL46tJSLGt7'
+PASS exportedJWK.alg is 'A192CBC'
+PASS exportedJWK.ext is true
+PASS exportedJWK.use is undefined
+PASS exportedJWK.key_ops is ['encrypt', 'decrypt', 'wrapKey', 'unwrapKey']
+
+Importing a key that's not extractable...
+
+Trying to export as raw...
+PASS Rejected, as expected
+error is: InvalidAccessError: key is not extractable
+Trying to export as jwk...
+PASS Rejected, as expected
+error is: InvalidAccessError: key is not extractable
+PASS successfullyParsed is true
+
+TEST COMPLETE
+