Add and persist a new field in AlternativeServiceInfo to list QUIC verisons advertised

components/cronet/ios/cronet_environment.mm

Index: components/cronet/ios/cronet_environment.mm
diff --git a/components/cronet/ios/cronet_environment.mm b/components/cronet/ios/cronet_environment.mm
index b9d36033029076f79029ba6e18313fe2a8dae7ba..af08d69c519239e22098d8df3764eec92df1bad2 100644
--- a/components/cronet/ios/cronet_environment.mm
+++ b/components/cronet/ios/cronet_environment.mm
@@ -41,6 +41,7 @@
 #include "net/log/net_log_capture_mode.h"
 #include "net/log/write_to_file_net_log_observer.h"
 #include "net/proxy/proxy_service.h"
+#include "net/quic/core/quic_versions.h"
 #include "net/socket/ssl_client_socket.h"
 #include "net/ssl/channel_id_service.h"
 #include "net/url_request/http_user_agent_settings.h"
@@ -325,13 +326,23 @@ void CronetEnvironment::InitializeOnNetworkThread() {
 
   std::unique_ptr<net::HttpServerProperties> http_server_properties(
       new net::HttpServerPropertiesImpl());
+  QuicVersionVector advertised_versions;
+  HttpNetworkSession::Params* params =
+      context_builder.GetNetworkSessionParams();
+  if (params) {
+    advertised_versions = params->quic_supported_versions;
+  } else {
+    advertised_versions = CurrentSupportedVersions();
+  }
+
   for (const auto& quic_hint : quic_hints_) {
     net::AlternativeService alternative_service(net::kProtoQUIC, "",
                                                 quic_hint.port());
     url::SchemeHostPort quic_hint_server("https", quic_hint.host(),
                                          quic_hint.port());
-    http_server_properties->SetAlternativeService(
-        quic_hint_server, alternative_service, base::Time::Max());
+    http_server_properties->SetQuicAlternativeService(

[Bence, 2017/06/16 14:43:40]

I believe this should also be called with an empty QuicVersionVector, because we
have no information about what versions the server support.

[Zhongyi Shi, 2017/06/20 23:23:37]

Acknowledged.

+        quic_hint_server, alternative_service, base::Time::Max(),
+        advertised_versions);
   }
 
   context_builder.SetHttpServerProperties(std::move(http_server_properties));