Add a new kMIDS (Max Incoming Dynamic Streams) config option, to eventually replace kMSPC.

net/quic/test_tools/quic_config_peer.cc

Index: net/quic/test_tools/quic_config_peer.cc
diff --git a/net/quic/test_tools/quic_config_peer.cc b/net/quic/test_tools/quic_config_peer.cc
index 1dac69d5d03d1503adbf3eb1e2d4c9e1920d243c..8a094d6ebd5061ee7b44e05d42efe232823d3d29 100644
--- a/net/quic/test_tools/quic_config_peer.cc
+++ b/net/quic/test_tools/quic_config_peer.cc
@@ -51,5 +51,12 @@ void QuicConfigPeer::SetReceivedDisableConnectionMigration(QuicConfig* config) {
   config->connection_migration_disabled_.SetReceivedValue(1);
 }
 
+// static
+void QuicConfigPeer::SetReceivedMaxIncomingDynamicStreams(
+    QuicConfig* config,
+    uint32_t max_streams) {
+  config->max_incoming_dynamic_streams_.SetReceivedValue(max_streams);
+}
+
 }  // namespace test
 }  // namespace net