Confirm QUIC alternative service upon success.

net/quic/quic_stream_factory.cc

Index: net/quic/quic_stream_factory.cc
diff --git a/net/quic/quic_stream_factory.cc b/net/quic/quic_stream_factory.cc
index cbcd45eed6f4641b1e701ab9d7fe6a625d307f9b..49c18f8f903454e1acbd8fdd33c503e0f6f74058 100644
--- a/net/quic/quic_stream_factory.cc
+++ b/net/quic/quic_stream_factory.cc
@@ -1072,6 +1072,14 @@ bool QuicStreamFactory::WasQuicRecentlyBroken(
       alternative_service);
 }
 
+void QuicStreamFactory::ConfirmQuic(const QuicServerId& server_id) const {
+  if (!http_server_properties_)
+    return;
+  const AlternativeService alternative_service(QUIC,
+                                               server_id.host_port_pair());
+  http_server_properties_->ConfirmAlternativeService(alternative_service);
+}
+
 bool QuicStreamFactory::CryptoConfigCacheIsEmpty(
     const QuicServerId& server_id) {
   QuicCryptoClientConfig::CachedState* cached =