[webcrypto] Import WebKit's webcrypto tests.

LayoutTests/crypto/aes-cbc-generate-key-expected.txt

Index: LayoutTests/crypto/aes-cbc-generate-key-expected.txt
diff --git a/LayoutTests/crypto/aes-cbc-generate-key-expected.txt b/LayoutTests/crypto/aes-cbc-generate-key-expected.txt
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+Test generating an AES key using AES-CBC algorithm.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Generating a key...
+error is: SyntaxError: AesKeyGenParams: length: Missing required property
+error is: SyntaxError: AesKeyGenParams: length: Is not a number
+error is: SyntaxError: AesKeyGenParams: length: Is not a number
+PASS key.type is 'secret'
+PASS key.extractable is true
+PASS key.algorithm.name is 'AES-CBC'
+PASS key.algorithm.length is 128
+PASS key.usages is ['encrypt', 'decrypt']
+PASS successfullyParsed is true
+
+TEST COMPLETE
+