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

components/cronet/android/cronet_url_request_context_adapter.cc

Index: components/cronet/android/cronet_url_request_context_adapter.cc
diff --git a/components/cronet/android/cronet_url_request_context_adapter.cc b/components/cronet/android/cronet_url_request_context_adapter.cc
index e042a2a49860a3d713adb257b77192b6ca273fea..a32864395c9e3ce9467d27006ad836b86d2a3d8a 100644
--- a/components/cronet/android/cronet_url_request_context_adapter.cc
+++ b/components/cronet/android/cronet_url_request_context_adapter.cc
@@ -63,6 +63,7 @@
 #include "net/nqe/network_qualities_prefs_manager.h"
 #include "net/proxy/proxy_config_service_android.h"
 #include "net/proxy/proxy_service.h"
+#include "net/quic/core/quic_versions.h"
 #include "net/sdch/sdch_owner.h"
 #include "net/ssl/channel_id_service.h"
 #include "net/url_request/url_request_context.h"
@@ -763,7 +764,8 @@ void CronetURLRequestContextAdapter::InitializeOnNetworkThread(
       net::AlternativeService alternative_service(
           net::kProtoQUIC, "", static_cast<uint16_t>(quic_hint.alternate_port));
       context_->http_server_properties()->SetAlternativeService(
-          quic_server, alternative_service, base::Time::Max());
+          quic_server, alternative_service, base::Time::Max(),
+          QuicVersionVector());

[Ryan Hamilton, 2017/06/07 20:52:23]

Would QuicSupportedVersions() be a better choice here? (I haven't looked deeper
to know so you're probably doing the right thing already)

[Zhongyi Shi, 2017/06/08 23:11:16]

Originally, an empty list should work, as the versions will be filled in
QuicStreamFactory later. I think it should be fine to add the versions this
network stack supports from the URLRequestContext. 

+xunjieli@: Helen, does this sound the right thing to do?

     }
   }