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

net/quic/test_tools/quic_config_peer.h

Index: net/quic/test_tools/quic_config_peer.h
diff --git a/net/quic/test_tools/quic_config_peer.h b/net/quic/test_tools/quic_config_peer.h
index c74d330d3bec7d98376ebbe420480a6bc6d7326f..33b9560721e9cb4349b6f5134678596e768e91cc 100644
--- a/net/quic/test_tools/quic_config_peer.h
+++ b/net/quic/test_tools/quic_config_peer.h
@@ -35,6 +35,9 @@ class QuicConfigPeer {
                                               uint32_t bytes);
   static void SetReceivedDisableConnectionMigration(QuicConfig* config);
 
+  static void SetReceivedMaxIncomingDynamicStreams(QuicConfig* config,
+                                                   uint32_t max_streams);
+
  private:
   DISALLOW_COPY_AND_ASSIGN(QuicConfigPeer);
 };