Add varz to track QUIC packets and bytes sent by transmission type.

net/quic/quic_utils.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_utils.h"
 
 #include <ctype.h>
 
 #include <algorithm>
 
@@ skipping 213 matching lines @@
   switch (level) {
     RETURN_STRING_LITERAL(ENCRYPTION_NONE);
     RETURN_STRING_LITERAL(ENCRYPTION_INITIAL);
     RETURN_STRING_LITERAL(ENCRYPTION_FORWARD_SECURE);
     RETURN_STRING_LITERAL(NUM_ENCRYPTION_LEVELS);
   }
   return "INVALID_ENCRYPTION_LEVEL";
 }
 
 // static
+const char* QuicUtils::TransmissionTypeToString(TransmissionType type) {
+  switch (type) {
+    RETURN_STRING_LITERAL(NOT_RETRANSMISSION);
+    RETURN_STRING_LITERAL(NACK_RETRANSMISSION);
+    RETURN_STRING_LITERAL(RTO_RETRANSMISSION);
+    RETURN_STRING_LITERAL(TLP_RETRANSMISSION);
+  }
+  return "INVALID_TRANSMISSION_TYPE";
+}
+
+// static
 string QuicUtils::TagToString(QuicTag tag) {
   char chars[4];
   bool ascii = true;
   const QuicTag orig_tag = tag;
 
   for (size_t i = 0; i < sizeof(chars); i++) {
     chars[i] = tag;
     if ((chars[i] == 0 || chars[i] == '\xff') && i == 3) {
       chars[i] = ' ';
     }
@@ skipping 47 matching lines @@
 QuicPriority QuicUtils::LowestPriority() {
   return QuicWriteBlockedList::kLowestPriority;
 }
 
 // static
 QuicPriority QuicUtils::HighestPriority() {
   return QuicWriteBlockedList::kHighestPriority;
 }
 
 }  // namespace net