WebCrypto: Add LayoutTests for ECDSA.

LayoutTests/crypto/ec-export-private-key-expected.txt

Index: LayoutTests/crypto/ec-export-private-key-expected.txt
diff --git a/LayoutTests/crypto/ec-export-private-key-expected.txt b/LayoutTests/crypto/ec-export-private-key-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..88cee675e2d6a4bdf6bdddb2855c9ca30da91e32
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+++ b/LayoutTests/crypto/ec-export-private-key-expected.txt
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+Test exporting a private RSA key.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+
+Importing a PKCS8 key...
+
+Exporting the key as JWK...
+PASS exportedJWK.kty is "EC"
+PASS exportedJWK.crv is "P-384"
+PASS exportedJWK.d is "pJLOj6kAhMIn4aMveXTTnp_2en6HBew0GbNftgdYK-vUYeCxUgrHbsLdTptj665x"
+PASS exportedJWK.x is "5V_ubEnY1SP1znv5wEJc5P9lBwi33lz7CVkBUjl5p_BCYC2zCFRzU2mBO1w_Xvho"
+PASS exportedJWK.y is "KPWcxdxQmJKpiNOKjiUZ3j0MT9D72wmT448YUGwXYGxeJCSSRvHOlJg6U2HFvpg-"
+PASS exportedJWK.alg is undefined
+PASS exportedJWK.ext is true
+PASS exportedJWK.key_ops is ['sign']
+PASS exportedJWK.use is undefined
+
+Exporting the key as PKCS8...
+PASS: exportedPkcs8 should be [3081b6020100301006072a8648ce3d020106052b8104002204819e30819b0201010430a492ce8fa90084c227e1a32f7974d39e9ff67a7e8705ec3419b35fb607582bebd461e0b1520ac76ec2dd4e9b63ebae71a16403620004e55fee6c49d8d523f5ce7bf9c0425ce4ff650708b7de5cfb095901523979a7f042602db30854735369813b5c3f5ef86828f59cc5dc509892a988d38a8e2519de3d0c4fd0fbdb0993e38f18506c17606c5e24249246f1ce94983a5361c5be983e] and was
+PASS successfullyParsed is true
+
+TEST COMPLETE
+