WebCrypto: Add LayoutTests for ECDSA.

LayoutTests/crypto/ecdsa-sign-verify-expected.txt

Index: LayoutTests/crypto/ecdsa-sign-verify-expected.txt
diff --git a/LayoutTests/crypto/rsa-pss-verify-expected.txt b/LayoutTests/crypto/ecdsa-sign-verify-expected.txt
similarity index 62%
copy from LayoutTests/crypto/rsa-pss-verify-expected.txt
copy to LayoutTests/crypto/ecdsa-sign-verify-expected.txt
index dcf252c6f3d8bab01bde9fb575fbc56cfb4a979d..70ee8f8fde7c14bbfb8f32efdac88e2df46c9d70 100644
--- a/LayoutTests/crypto/rsa-pss-verify-expected.txt
+++ b/LayoutTests/crypto/ecdsa-sign-verify-expected.txt
@@ -1,10 +1,15 @@
-Test verification using RSA-PSS and salt length of 10.
+Test importing an EC key for ECDSA.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
+Importing a public key...
 
-Verifying known signature...
+Importing a private key...
+
+Signing some text...
+
+Verifying the signature...
 PASS verificationResult is true
 
 Verifying a bad signature...