Introduces ability for session to wait on a migration trigger for a new

net/quic/chromium/quic_stream_factory.h

Index: net/quic/chromium/quic_stream_factory.h
diff --git a/net/quic/chromium/quic_stream_factory.h b/net/quic/chromium/quic_stream_factory.h
index 9bf67338f8c8e4b9c778c957a41ea38a116e59d4..5ca741e1c8f27fb29836c1b6dd751beb06aefe49 100644
--- a/net/quic/chromium/quic_stream_factory.h
+++ b/net/quic/chromium/quic_stream_factory.h
@@ -80,6 +80,18 @@ enum class MigrationResult {
   FAILURE          // Migration failed for other reasons.
 };
 
+enum QuicConnectionMigrationStatus {
+  MIGRATION_STATUS_NO_MIGRATABLE_STREAMS,
+  MIGRATION_STATUS_ALREADY_MIGRATED,
+  MIGRATION_STATUS_INTERNAL_ERROR,
+  MIGRATION_STATUS_TOO_MANY_CHANGES,
+  MIGRATION_STATUS_SUCCESS,
+  MIGRATION_STATUS_NON_MIGRATABLE_STREAM,
+  MIGRATION_STATUS_DISABLED,
+  MIGRATION_STATUS_NO_ALTERNATE_NETWORK,
+  MIGRATION_STATUS_MAX
+};
+
 // Encapsulates a pending request for a QuicHttpStream.
 // If the request is still pending when it is destroyed, it will
 // cancel the request with the factory.