diff --git a/src/net/spdy/spdy_credential_builder.h b/src/net/spdy/spdy_credential_builder.h
new file mode 100644
index 0000000..278d239
--- /dev/null
+++ b/src/net/spdy/spdy_credential_builder.h
@@ -0,0 +1,38 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_SPDY_SPDY_CREDENTIAL_BUILDER_H_
+#define NET_SPDY_SPDY_CREDENTIAL_BUILDER_H_
+
+#include <string>
+
+#include "net/base/net_export.h"
+#include "net/base/ssl_client_cert_type.h"
+
+namespace net {
+
+class SSLClientSocket;
+struct SpdyCredential;
+
+// This class provides facilities for building the various fields of
+// SPDY CREDENTIAL frames.
+class NET_EXPORT_PRIVATE SpdyCredentialBuilder {
+ public:
+  static int Build(const std::string& tls_unique,
+                   SSLClientCertType type,
+                   const std::string& key,
+                   const std::string& cert,
+                   size_t slot,
+                   SpdyCredential* credential);
+
+ private:
+  friend class SpdyCredentialBuilderTest;
+
+  // Returns the secret data to be signed as part of a credential frame.
+  static std::string GetCredentialSecret(const std::string& tls_unique);
+};
+
+}  // namespace net
+
+#endif  // NET_SPDY_SPDY_CREDENTIAL_BUILDER_H_