Add a new GetTlsUniqueChannelBinding method to SSLSocket, and implement nss version.

net/socket/ssl_client_socket_openssl.h

Index: net/socket/ssl_client_socket_openssl.h
diff --git a/net/socket/ssl_client_socket_openssl.h b/net/socket/ssl_client_socket_openssl.h
index d113f8267a6b6903aa6cdd235d4e6ec3957e464c..95947f7944c07a312b6429157fbffa7f254f132c 100644
--- a/net/socket/ssl_client_socket_openssl.h
+++ b/net/socket/ssl_client_socket_openssl.h
@@ -54,14 +54,19 @@ class SSLClientSocketOpenSSL : public SSLClientSocket {
   int SelectNextProtoCallback(unsigned char** out, unsigned char* outlen,
                               const unsigned char* in, unsigned int inlen);
 
-  // SSLClientSocket implementation.
-  virtual void GetSSLCertRequestInfo(
-      SSLCertRequestInfo* cert_request_info) OVERRIDE;
+  // SSLSocket implementation.
   virtual int ExportKeyingMaterial(const base::StringPiece& label,
                                    bool has_context,
                                    const base::StringPiece& context,
                                    unsigned char* out,
                                    unsigned int outlen) OVERRIDE;
+  virtual int GetTlsUniqueChannelBinding(unsigned char* out,
+                                         unsigned int *outlen,
+                                         unsigned int outlen_max) OVERRIDE;
+
+  // SSLClientSocket implementation.
+  virtual void GetSSLCertRequestInfo(
+      SSLCertRequestInfo* cert_request_info) OVERRIDE;
   virtual NextProtoStatus GetNextProto(std::string* proto,
                                        std::string* server_protos) OVERRIDE;
   virtual ServerBoundCertService* GetServerBoundCertService() const OVERRIDE;