Add new methods to QuicFramer for controlling decrypters

This CL is a roll forward of cl/243273832. David had to make test-only changes to fix the broken test //third_party/quic/core:tls_handshaker_test. And the chromium patch is ready.

gfe-relnote: Protected behind QUIC_VERSION_99 and quic_supports_tls_handshake
PiperOrigin-RevId: 243344023
Change-Id: Ia845325b55557d4d8811d6641ae5b50bdf2aed45
diff --git a/quic/core/quic_packet_generator_test.cc b/quic/core/quic_packet_generator_test.cc
index 223383a..1e12424 100644
--- a/quic/core/quic_packet_generator_test.cc
+++ b/quic/core/quic_packet_generator_test.cc
@@ -9,6 +9,7 @@
 #include <string>
 
 #include "net/third_party/quiche/src/quic/core/crypto/crypto_protocol.h"
+#include "net/third_party/quiche/src/quic/core/crypto/null_decrypter.h"
 #include "net/third_party/quiche/src/quic/core/crypto/null_encrypter.h"
 #include "net/third_party/quiche/src/quic/core/crypto/quic_decrypter.h"
 #include "net/third_party/quiche/src/quic/core/crypto/quic_encrypter.h"
@@ -215,6 +216,11 @@
         QuicMakeUnique<NullEncrypter>(Perspective::IS_CLIENT));
     creator_->set_encryption_level(ENCRYPTION_FORWARD_SECURE);
     framer_.set_data_producer(&producer_);
+    if (simple_framer_.framer()->version().KnowsWhichDecrypterToUse()) {
+      simple_framer_.framer()->InstallDecrypter(
+          ENCRYPTION_FORWARD_SECURE,
+          QuicMakeUnique<NullDecrypter>(Perspective::IS_SERVER));
+    }
     generator_.AttachPacketFlusher();
   }