Update from https://crrev.com/305340

net/quic/quic_server_session.cc

Index: net/quic/quic_server_session.cc
diff --git a/net/quic/quic_server_session.cc b/net/quic/quic_server_session.cc
index 1d48182af2a9061146b8ae15da5a93daa501675a..e0defd680efb35a5b3c736e9e80974434a249665 100644
--- a/net/quic/quic_server_session.cc
+++ b/net/quic/quic_server_session.cc
@@ -37,14 +37,29 @@ QuicCryptoServerStream* QuicServerSession::CreateQuicCryptoServerStream(
 
 void QuicServerSession::OnConfigNegotiated() {
   QuicSession::OnConfigNegotiated();
-  if (!FLAGS_enable_quic_fec ||
-      !config()->HasReceivedConnectionOptions() ||
-      !ContainsQuicTag(config()->ReceivedConnectionOptions(), kFHDR)) {
+
+  if (!config()->HasReceivedConnectionOptions()) {
     return;
   }
-  // kFHDR config maps to FEC protection always for headers stream.
-  // TODO(jri): Add crypto stream in addition to headers for kHDR.
-  headers_stream_->set_fec_policy(FEC_PROTECT_ALWAYS);
+
+  // If the client has provided a bandwidth estimate from the same serving
+  // region, then pass it to the sent packet manager in preparation for possible
+  // bandwidth resumption.
+  const CachedNetworkParameters* cached_network_params =
+      crypto_stream_->previous_cached_network_params();
+  if (FLAGS_quic_enable_bandwidth_resumption_experiment &&
+      cached_network_params != nullptr &&
+      ContainsQuicTag(config()->ReceivedConnectionOptions(), kBWRE) &&
+      cached_network_params->serving_region() == serving_region_) {
+    connection()->ResumeConnectionState(*cached_network_params);
+  }
+
+  if (FLAGS_enable_quic_fec &&
+      ContainsQuicTag(config()->ReceivedConnectionOptions(), kFHDR)) {
+    // kFHDR config maps to FEC protection always for headers stream.
+    // TODO(jri): Add crypto stream in addition to headers for kHDR.
+    headers_stream_->set_fec_policy(FEC_PROTECT_ALWAYS);
+  }
 }
 
 void QuicServerSession::OnConnectionClosed(QuicErrorCode error,