Improve LayoutTest output for Errors

LayoutTests/crypto/aes-cbc-generateKey-parseAlgorithm-failures-expected.txt

Index: LayoutTests/crypto/aes-cbc-generateKey-parseAlgorithm-failures-expected.txt
diff --git a/LayoutTests/crypto/aes-cbc-generateKey-parseAlgorithm-failures-expected.txt b/LayoutTests/crypto/aes-cbc-generateKey-parseAlgorithm-failures-expected.txt
index cfd4342fe888edf2e3382b11d5d65d9c7b5b892e..c2fa0820b5ebc9f7bb6186e18d88a87513b13a71 100644
--- a/LayoutTests/crypto/aes-cbc-generateKey-parseAlgorithm-failures-expected.txt
+++ b/LayoutTests/crypto/aes-cbc-generateKey-parseAlgorithm-failures-expected.txt
@@ -3,12 +3,26 @@ Tests generateKey() with bad AES-CBC parameters.
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
+
+generateKey() with invalid keyUsages value that is -1...
 error is: TypeError: Failed to execute 'generateKey' on 'SubtleCrypto': The 3rd argument is neither an array, nor does it have indexed properties.
+
+generateKey() with invalid keyUsages value that is null...
 error is: TypeError: Failed to execute 'generateKey' on 'SubtleCrypto': The 3rd argument is neither an array, nor does it have indexed properties.
+
+generateKey() with bad keyUsages value that is a string...
 error is: SyntaxError: Invalid keyUsages argument
+
+generateKey() without length...
 error is: TypeError: AesKeyGenParams: length: Missing required property
+
+generateKey() with length larger than range...
 error is: TypeError: AesKeyGenParams: length: Outside of numeric range
+
+generateKey() with negative length...
 error is: TypeError: AesKeyGenParams: length: Outside of numeric range
+
+generateKey() with length that is minus Infinity...
 error is: TypeError: AesKeyGenParams: length: Outside of numeric range
 PASS successfullyParsed is true