[webcrypto] Import WebKit's webcrypto tests.

LayoutTests/crypto/hmac-generate-key-expected.txt

Index: LayoutTests/crypto/hmac-generate-key-expected.txt
diff --git a/LayoutTests/crypto/hmac-generate-key-expected.txt b/LayoutTests/crypto/hmac-generate-key-expected.txt
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+Test generating a HMAC key.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+
+Generating a key with default length...
+error is: TypeError: Failed to execute 'generateKey' on 'SubtleCrypto': parameter 1 ('algorithm') is not an object.
+error is: SyntaxError: HmacKeyGenParams: hash: Missing or not a dictionary
+error is: SyntaxError: HmacKeyGenParams: length: Is not a number
+error is: SyntaxError: HmacKeyGenParams: length: Is not a number
+PASS key.type is 'secret'
+PASS key.extractable is true
+PASS key.algorithm.name is 'HMAC'
+PASS key.algorithm.length is 512
+PASS key.usages is ["sign", "verify"]
+
+Generating a key with custom length...
+PASS key.type is 'secret'
+PASS key.extractable is true
+PASS key.algorithm.name is 'HMAC'
+PASS key.algorithm.length is 40
+PASS key.usages is ["sign"]
+PASS successfullyParsed is true
+
+TEST COMPLETE
+