Implement SSL server socket over OpenSSL.

crypto/openssl_util.h

Index: crypto/openssl_util.h
diff --git a/crypto/openssl_util.h b/crypto/openssl_util.h
index e8483c9633ed577eabe24aecb9aab6182b4fbbe5..bf83e470eb3a1eea62bbd50fe13177da43124188 100644
--- a/crypto/openssl_util.h
+++ b/crypto/openssl_util.h
@@ -82,7 +82,8 @@ class ScopedOpenSSLSafeSizeBuffer {
 };
 
 // Initialize OpenSSL if it isn't already initialized. This must be called
-// before any other OpenSSL functions.
+// before any other OpenSSL functions though it is safe and cheap to call this
+// multiple times.
 // This function is thread-safe, and OpenSSL will only ever be initialized once.
 // OpenSSL will be properly shut down on program exit.
 void CRYPTO_EXPORT EnsureOpenSSLInit();