Add autothread to pseudo-tcp fuzzer.

webrtc/test/fuzzers/pseudotcp_parser_fuzzer.cc

Index: webrtc/test/fuzzers/pseudotcp_parser_fuzzer.cc
diff --git a/webrtc/test/fuzzers/pseudotcp_parser_fuzzer.cc b/webrtc/test/fuzzers/pseudotcp_parser_fuzzer.cc
index f373e6cf9f1a1e31d86557ad987fe9fa3d48ba8d..404bb483978dc9bec39f00333f5aa81ec7b74983 100644
--- a/webrtc/test/fuzzers/pseudotcp_parser_fuzzer.cc
+++ b/webrtc/test/fuzzers/pseudotcp_parser_fuzzer.cc
@@ -11,6 +11,7 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#include "webrtc/base/thread.h"
 #include "webrtc/p2p/base/pseudotcp.h"
 
 namespace webrtc {
@@ -33,6 +34,8 @@ struct Environment {
   explicit Environment(cricket::IPseudoTcpNotify* notifier) {
     ptcp = new cricket::PseudoTcp(notifier, 0);
   }
+
+  rtc::AutoThread thread;
 };
 
 Environment* env = new Environment(new FakeIPseudoTcpNotify());