Move StatelessRejector to a heap-allocated model

net/tools/quic/quic_dispatcher.h

Index: net/tools/quic/quic_dispatcher.h
diff --git a/net/tools/quic/quic_dispatcher.h b/net/tools/quic/quic_dispatcher.h
index fc62b03f60d6deb885c094a05765503301abfb7e..59f229bbffa1c7d461802193d8ec92b5bbc45da0 100644
--- a/net/tools/quic/quic_dispatcher.h
+++ b/net/tools/quic/quic_dispatcher.h
@@ -22,6 +22,8 @@
 #include "net/quic/core/quic_connection.h"
 #include "net/quic/core/quic_protocol.h"
 #include "net/quic/core/quic_server_session_base.h"
+
+#include "net/tools/quic/stateless_rejector.h"
 #include "net/tools/quic/quic_process_packet_interface.h"
 #include "net/tools/quic/quic_time_wait_list_manager.h"
 
@@ -266,6 +268,7 @@ class QuicDispatcher : public QuicServerSessionBase::Visitor,
 
  private:
   friend class net::test::QuicDispatcherPeer;
+  friend class StatelessRejectorProcessDoneCallback;
 
   // Removes the session from the session map and write blocked list, and adds
   // the ConnectionId to the time-wait list.  If |session_closed_statelessly| is
@@ -275,11 +278,11 @@ class QuicDispatcher : public QuicServerSessionBase::Visitor,
   bool HandlePacketForTimeWait(const QuicPacketPublicHeader& header);
 
   // Attempts to reject the connection statelessly, if stateless rejects are
-  // possible and if the current packet contains a CHLO message.
-  // Returns a fate which describes what subsequent processing should be
-  // performed on the packets, like ValidityChecks.
-  QuicPacketFate MaybeRejectStatelessly(QuicConnectionId connection_id,
-                                        const QuicPacketHeader& header);
+  // possible and if the current packet contains a CHLO message.  Determines a
+  // fate which describes what subsequent processing should be performed on the
+  // packets, like ValidityChecks, and invokes ProcessUnauthenticatedHeaderFate.
+  void MaybeRejectStatelessly(QuicConnectionId connection_id,
+                              const QuicPacketHeader& header);
 
   // Deliver |packets| to |session| for further processing.
   void DeliverPacketsToSession(
@@ -292,6 +295,12 @@ class QuicDispatcher : public QuicServerSessionBase::Visitor,
                                         QuicConnectionId connection_id,
                                         QuicPacketNumber packet_number);
 
+  // Invoked when StatelessRejector::Process completes.
+  void OnStatelessRejectorProcessDone(
+      std::unique_ptr<StatelessRejector> rejector,
+      QuicPacketNumber packet_number,
+      QuicVersion first_version);
+
   void set_new_sessions_allowed_per_event_loop(
       int16_t new_sessions_allowed_per_event_loop) {
     new_sessions_allowed_per_event_loop_ = new_sessions_allowed_per_event_loop;