Support tls-server-end-point channel bindings for HTTP authentication.

net/cert/x509_util.h

Index: net/cert/x509_util.h
diff --git a/net/cert/x509_util.h b/net/cert/x509_util.h
index fb8c20f080d3f756256eab328f2f4d70d7a13844..bd254563717ab558d17813f0d14d1091e935345b 100644
--- a/net/cert/x509_util.h
+++ b/net/cert/x509_util.h
@@ -31,6 +31,12 @@ enum DigestAlgorithm {
   DIGEST_SHA256
 };
 
+// Generate a 'tls-server-end-point' channel binding based on the specified
+// certificate. Channel bindings are based on RFC 5929.
+NET_EXPORT_PRIVATE bool GetTLSServerEndPointChannelBinding(
+    const X509Certificate& certificate,
+    std::string* token);
+
 // Creates a public-private keypair and a self-signed certificate.
 // Subject, serial number and validity period are given as parameters.
 // The certificate is signed by the private key in |key|. The key length and