Move StatelessRejector to a heap-allocated model

net/tools/quic/stateless_rejector.h

Index: net/tools/quic/stateless_rejector.h
diff --git a/net/tools/quic/stateless_rejector.h b/net/tools/quic/stateless_rejector.h
index 39c03a1d896cdfdf906fc1089bc31fd04366614d..b092f957edba2293000c690fa80b139704c6917b 100644
--- a/net/tools/quic/stateless_rejector.h
+++ b/net/tools/quic/stateless_rejector.h
@@ -17,6 +17,7 @@ namespace net {
 class StatelessRejector {
  public:
   enum State {
+    UNKNOWN,      // State has not yet been determined
     UNSUPPORTED,  // Stateless rejects are not supported
     FAILED,       // There was an error processing the CHLO.
     ACCEPTED,     // The CHLO was accepted
@@ -35,13 +36,24 @@ class StatelessRejector {
 
   ~StatelessRejector();
 
-  // Called when |chlo| is received for |connection_id| to determine
-  // if it should be statelessly rejected.
+  // Called when |chlo| is received for |connection_id|.
   void OnChlo(QuicVersion version,
               QuicConnectionId connection_id,
               QuicConnectionId server_designated_connection_id,
               const CryptoHandshakeMessage& chlo);
 
+  class ProcessDoneCallback {
+   public:
+    virtual ~ProcessDoneCallback() = default;
+    virtual void Run(std::unique_ptr<StatelessRejector> rejector) = 0;
+  };
+
+  // Perform processing to determine whether the CHLO received in OnChlo should
+  // be statelessly rejected, and invoke the callback once a decision has been
+  // made.
+  static void Process(std::unique_ptr<StatelessRejector> rejector,
+                      std::unique_ptr<ProcessDoneCallback> cb);
+
   // Returns the state of the rejector after OnChlo() has been called.
   State state() const { return state_; }
 
@@ -51,6 +63,9 @@ class StatelessRejector {
   // Returns the error details when state() returns FAILED.
   std::string error_details() const { return error_details_; }
 
+  // Returns the connection ID.
+  QuicConnectionId connection_id() const { return connection_id_; }
+
   // Returns the SREJ message when state() returns REJECTED.
   const CryptoHandshakeMessage& reply() const { return reply_; }
 
@@ -62,7 +77,9 @@ class StatelessRejector {
 
   void ProcessClientHello(
       const CryptoHandshakeMessage& client_hello,
-      const ValidateClientHelloResultCallback::Result& result);
+      const ValidateClientHelloResultCallback::Result& result,
+      std::unique_ptr<StatelessRejector> rejector,
+      std::unique_ptr<StatelessRejector::ProcessDoneCallback> cb);
 
   State state_;
   QuicErrorCode error_;
@@ -78,7 +95,7 @@ class StatelessRejector {
   QuicRandom* random_;
   const QuicCryptoServerConfig* crypto_config_;
   QuicCompressedCertsCache* compressed_certs_cache_;
-  const CryptoHandshakeMessage* chlo_;
+  CryptoHandshakeMessage chlo_;
   CryptoHandshakeMessage reply_;
   CryptoFramer crypto_framer_;
   QuicCryptoProof proof_;