Upload pk8 key files for ClientCertStoreChromeOS unittest.

net/data/ssl/certificates/README

Index: net/data/ssl/certificates/README
diff --git a/net/data/ssl/certificates/README b/net/data/ssl/certificates/README
index 9634a282a8bff4d73de3936e9b5bf74eba09f9ac..17247f369fa939ce796bb6fcc1c4c40552bc9eeb 100644
--- a/net/data/ssl/certificates/README
+++ b/net/data/ssl/certificates/README
@@ -149,9 +149,11 @@ unit tests.
 
 - client_1.pem
 - client_1.key
+- client_1.pk8
 - client_1_ca.pem
 - client_2.pem
 - client_2.key
+- client_2.pk8
 - client_2_ca.pem
      This is a set of files used to unit test SSL client certificate
      authentication. These are generated by
@@ -162,6 +164,8 @@ unit tests.
        private key for a first certificate signed by client_1_ca.pem.
      - client_2.pem and client_2.key correspond to the certificate and
        private key for a second certificate signed by client_2_ca.pem.
+     - each .pk8 file contains the same key as the corresponding .key file
+       as PKCS#8 PrivateKeyInfo in DER encoding.
 
 - eku-test-root.pem
 - non-crit-codeSigning-chain.pem