Disable connection migration if disabled in config sent by server.

components/domain_reliability/quic_error_mapping.cc

 // Copyright 2016 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 "components/domain_reliability/quic_error_mapping.h"
 
 namespace domain_reliability {
 
 namespace {
 
@@ skipping 201 matching lines @@
   // Connection changed networks too many times.
   { net::QUIC_CONNECTION_MIGRATION_TOO_MANY_CHANGES,
     "quic.connection_migration_too_many_changes" },
   // Connection migration was attempted, but there was no new network to
   // migrate to.
   { net::QUIC_CONNECTION_MIGRATION_NO_NEW_NETWORK,
     "quic.connection_migration_no_new_network" },
   // Network changed, but connection had one or more non-migratable streams.
   { net::QUIC_CONNECTION_MIGRATION_NON_MIGRATABLE_STREAM,
     "quic.connection_migration_non_migratable_stream" },
+  // Connection migration was not attempted because it was disabled in the
+  // received config.
+  { net::QUIC_CONNECTION_MIGRATION_DISABLED,
+    "quic.connection_migration_disabled" },
+
   // Stream frame overlaps with buffered data.
   { net::QUIC_OVERLAPPING_STREAM_DATA,
     "quic.overlapping_stream_data" },
 
   // No error. Used as bound while iterating.
   { net::QUIC_LAST_ERROR, "quic.last_error"}
 };
 
 static_assert(arraysize(kQuicErrorMap) == net::kActiveQuicErrorCount,
               "quic_error_map is not in sync with quic protocol!");
@@ skipping 11 matching lines @@
         *beacon_quic_error_out = kQuicErrorMap[i].beacon_quic_error;
         return true;
       }
     }
   }
   beacon_quic_error_out->clear();
   return false;
 }
 
 }  // namespace domain_reliability