Add Data Saver support to Cronet

components/cronet/android/cronet_url_request_adapter.cc

Index: components/cronet/android/cronet_url_request_adapter.cc
diff --git a/components/cronet/android/cronet_url_request_adapter.cc b/components/cronet/android/cronet_url_request_adapter.cc
index 80e1c639480c82dd5258d0d45f003ced637bda39..5e445604ef9ba372d0ef8baf271e0a0217a4f2f2 100644
--- a/components/cronet/android/cronet_url_request_adapter.cc
+++ b/components/cronet/android/cronet_url_request_adapter.cc
@@ -117,6 +117,11 @@ const std::string& CronetURLRequestAdapter::GetNegotiatedProtocol() const {
   return url_request_->response_info().npn_negotiated_protocol;
 }
 
+const std::string CronetURLRequestAdapter::GetProxyServer() const {
+  DCHECK(IsOnNetworkThread());
+  return url_request_->response_info().proxy_server.ToString();
+}
+
 bool CronetURLRequestAdapter::GetWasCached() const {
   DCHECK(IsOnNetworkThread());
   return url_request_->response_info().was_cached;