QUIC: Add packet_reader_yield_after_duration_milliseconds field trial param.

components/network_session_configurator/network_session_configurator_unittest.cc

Index: components/network_session_configurator/network_session_configurator_unittest.cc
diff --git a/components/network_session_configurator/network_session_configurator_unittest.cc b/components/network_session_configurator/network_session_configurator_unittest.cc
index fe724146c3ae9b07225f1daf0fc9b8c1186e1d18..0b11fb1e46adebddf94f35e0515a0f3755cc86f1 100644
--- a/components/network_session_configurator/network_session_configurator_unittest.cc
+++ b/components/network_session_configurator/network_session_configurator_unittest.cc
@@ -80,6 +80,8 @@ TEST_F(NetworkSessionConfiguratorTest, EnableQuicFromFieldTrialGroup) {
   EXPECT_FALSE(params_.quic_close_sessions_on_ip_change);
   EXPECT_EQ(net::kIdleConnectionTimeoutSeconds,
             params_.quic_idle_connection_timeout_seconds);
+  EXPECT_EQ(net::kQuicYieldAfterDurationMilliseconds,
+            params_.quic_packet_reader_yield_after_duration_milliseconds);
   EXPECT_FALSE(params_.quic_disable_preconnect_if_0rtt);
   EXPECT_FALSE(params_.quic_migrate_sessions_on_network_change);
   EXPECT_FALSE(params_.quic_migrate_sessions_early);
@@ -138,6 +140,18 @@ TEST_F(NetworkSessionConfiguratorTest,
   EXPECT_EQ(300, params_.quic_idle_connection_timeout_seconds);
 }
 
+TEST_F(NetworkSessionConfiguratorTest,
+       QuicPacketReaderYieldAfterDurationMillisecondsFieldTrialParams) {
+  std::map<std::string, std::string> field_trial_params;
+  field_trial_params["packet_reader_yield_after_duration_milliseconds"] = "10";
+  variations::AssociateVariationParams("QUIC", "Enabled", field_trial_params);
+  base::FieldTrialList::CreateFieldTrial("QUIC", "Enabled");
+
+  ParseFieldTrials();
+
+  EXPECT_EQ(10, params_.quic_packet_reader_yield_after_duration_milliseconds);
+}
+
 TEST_F(NetworkSessionConfiguratorTest, QuicDisablePreConnectIfZeroRtt) {
   std::map<std::string, std::string> field_trial_params;
   field_trial_params["disable_preconnect_if_0rtt"] = "true";