Update from https://crrev.com/305340

net/tools/quic/quic_server_session_test.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/tools/quic/quic_server_session.h"
 
 #include "net/quic/crypto/cached_network_parameters.h"
 #include "net/quic/crypto/quic_crypto_server_config.h"
 #include "net/quic/crypto/quic_random.h"
 #include "net/quic/quic_connection.h"
@@ skipping 274 matching lines @@
       session_.get(), kClientDataStreamId1);
   ASSERT_TRUE(stream);
   EXPECT_EQ(FEC_PROTECT_OPTIONAL, stream->fec_policy());
 }
 
 class MockQuicCryptoServerStream : public QuicCryptoServerStream {
  public:
   explicit MockQuicCryptoServerStream(
       const QuicCryptoServerConfig& crypto_config, QuicSession* session)
       : QuicCryptoServerStream(crypto_config, session) {}
-  virtual ~MockQuicCryptoServerStream() {}
+  ~MockQuicCryptoServerStream() override {}
 
   MOCK_METHOD1(SendServerConfigUpdate,
                void(const CachedNetworkParameters* cached_network_parameters));
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockQuicCryptoServerStream);
 };
 
 TEST_P(QuicServerSessionTest, BandwidthEstimates) {
   if (version() <= QUIC_VERSION_21) {
@@ skipping 70 matching lines @@
   expected_network_params.set_timestamp(
       session_->connection()->clock()->WallNow().ToUNIXSeconds());
   expected_network_params.set_serving_region(serving_region);
 
   EXPECT_CALL(*crypto_stream,
               SendServerConfigUpdate(EqualsProto(expected_network_params)))
       .Times(1);
   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
 }  // namespace net