Preparation for Chrome experiment to enable bandwidth resumption.

net/tools/quic/quic_server_session_test.cc

Index: net/tools/quic/quic_server_session_test.cc
diff --git a/net/tools/quic/quic_server_session_test.cc b/net/tools/quic/quic_server_session_test.cc
index 694f31614277673b0e2b198be635d48f9aa5446d..b0ed5d1ec1d9090e20ea684aa737c5cecd1a4763 100644
--- a/net/tools/quic/quic_server_session_test.cc
+++ b/net/tools/quic/quic_server_session_test.cc
@@ -383,6 +383,46 @@ TEST_P(QuicServerSessionTest, BandwidthEstimates) {
   session_->OnCongestionWindowChange(now);
 }
 
+TEST_P(QuicServerSessionTest, BandwidthResumptionExperiment) {
+  ValueRestore<bool> old_flag(
+      &FLAGS_quic_enable_bandwidth_resumption_experiment, true);
+
+  // Test that if a client provides a CachedNetworkParameters with the same
+  // serving region as the current server, that this data is passed down to the
+  // send algorithm.
+
+  // Client has sent kBWRE connection option to trigger bandwidth resumption.
+  QuicTagVector copt;
+  copt.push_back(kBWRE);
+  QuicConfigPeer::SetReceivedConnectionOptions(session_->config(), copt);
+
+  const string kTestServingRegion = "a serving region";
+  session_->set_serving_region(kTestServingRegion);
+
+  QuicCryptoServerStream* crypto_stream =
+      static_cast<QuicCryptoServerStream*>(
+          QuicSessionPeer::GetCryptoStream(session_.get()));
+
+  // No effect if no CachedNetworkParameters provided.
+  EXPECT_CALL(*connection_, ResumeConnectionState(_)).Times(0);
+  session_->OnConfigNegotiated();
+
+  // No effect if CachedNetworkParameters provided, but different serving
+  // regions.
+  CachedNetworkParameters cached_network_params;
+  cached_network_params.set_bandwidth_estimate_bytes_per_second(1);
+  cached_network_params.set_serving_region("different serving region");
+  crypto_stream->set_previous_cached_network_params(cached_network_params);
+  EXPECT_CALL(*connection_, ResumeConnectionState(_)).Times(0);
+  session_->OnConfigNegotiated();
+
+  // Same serving region results in CachedNetworkParameters being stored.
+  cached_network_params.set_serving_region(kTestServingRegion);
+  crypto_stream->set_previous_cached_network_params(cached_network_params);
+  EXPECT_CALL(*connection_, ResumeConnectionState(_)).Times(1);
+  session_->OnConfigNegotiated();
+}
+
 }  // namespace
 }  // namespace test
 }  // namespace tools