Webcrypto: add layout tests for HKDF algorithm

LayoutTests/crypto/subtle/hkdf-importKey-expected.txt

Index: LayoutTests/crypto/subtle/hkdf-importKey-expected.txt
diff --git a/LayoutTests/crypto/subtle/hkdf-importKey-expected.txt b/LayoutTests/crypto/subtle/hkdf-importKey-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a9b1d8b4c7b7705f2fbf1dfbc12ab344f1051838
--- /dev/null
+++ b/LayoutTests/crypto/subtle/hkdf-importKey-expected.txt
@@ -0,0 +1,26 @@
+Test bad inputs to HKDF deriveBits()
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+
+importKey() with bad usages...

[eroman, 2014/12/23 23:29:39]

rather than say "bad usages" say which uses were used ['encrypt'].

Then when reviewing the test expectations (and possible failures) it is easier
to tell what is happening and why.

[nharper, 2015/01/06 23:51:59]

Done.

+error is: SyntaxError: Cannot create a key using the specified key usages.
+
+importKey() with null key...
+error is: DataError: Key data must be a buffer for non-JWK formats
+
+importKey() with jwk type...
+error is: DataError: Key data must be an object for JWK import
+
+importKey() with spki type...
+error is: NotSupportedError: Unsupported import key format for algorithm
+
+importKey() with empty usages...
+error is: SyntaxError: Usages cannot be empty when creating a key.
+
+importKey() correctly
+PASS successfullyParsed is true
+
+TEST COMPLETE
+