Change a DVLOG(1) to DVLOG_IF because it is very verbose.

Merge internal change: 191592257

R=rch@chromium.org

Change-Id: I6b18da8eb73506819c8be3853e33715ab3cf62b7
Reviewed-on: https://chromium-review.googlesource.com/999327Reviewed-by: Ryan Hamilton <rch@chromium.org>
Commit-Queue: Fan Yang <fayang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548788}

net/quic/core/quic_packet_creator.cc

@@ -645,8 +645,9 @@ void QuicPacketCreator::SetConnectionIdLength(QuicConnectionIdLength length) {
 
 void QuicPacketCreator::SetTransmissionType(TransmissionType type) {
   DCHECK(can_set_transmission_type_);
-  QUIC_DVLOG(1) << "Setting Transmission type to "
-                << QuicUtils::TransmissionTypeToString(type);
+  QUIC_DVLOG_IF(1, type != packet_.transmission_type)
+      << "Setting Transmission type to "
+      << QuicUtils::TransmissionTypeToString(type);
   packet_.transmission_type = type;
 }
 

net/quic/platform/api/quic_logging.h

@@ -13,6 +13,8 @@
 // they would simply be translated to LOG.
 
 #define QUIC_DVLOG(verbose_level) QUIC_DVLOG_IMPL(verbose_level)
+#define QUIC_DVLOG_IF(verbose_level, condition) \
+  QUIC_DVLOG_IF_IMPL(verbose_level, condition)
 #define QUIC_DLOG(severity) QUIC_DLOG_IMPL(severity)
 #define QUIC_DLOG_IF(severity, condition) QUIC_DLOG_IF_IMPL(severity, condition)
 #define QUIC_VLOG(verbose_level) QUIC_VLOG_IMPL(verbose_level)

net/quic/platform/impl/quic_logging_impl.h

@@ -42,6 +42,8 @@
 #define QUIC_CHROMIUM_DLOG_IF_DFATAL(condition) DLOG_IF(DFATAL, condition)
 
 #define QUIC_DVLOG_IMPL(verbose_level) DVLOG(verbose_level)
+#define QUIC_DVLOG_IF_IMPL(verbose_level, condition) \
+  DVLOG_IF(verbose_level, condition)
 
 #if defined(OS_WIN)
 // wingdi.h defines ERROR to be 0. When we call QUIC_DLOG(ERROR), it gets