Add VLOG(1)s for logging the compressed and uncompressed QPACK header bytes.

PiperOrigin-RevId: 951747213

quiche/quic/core/http/quic_spdy_session.cc

diff --git a/quiche/quic/core/http/quic_spdy_session.cc b/quiche/quic/core/http/quic_spdy_session.cc
index 09bd800..bbecf8b 100644
--- a/quiche/quic/core/http/quic_spdy_session.cc
+++ b/quiche/quic/core/http/quic_spdy_session.cc
@@ -1764,11 +1764,15 @@
   // be the same across calls for any given call site.
   if (using_qpack) {
     if (is_sent) {
+      QUIC_VLOG(1) << "QPACK headers sent compressed: " << compressed
+                   << " uncompressed:" << uncompressed;
       QUIC_HISTOGRAM_COUNTS("QuicSession.HeaderCompressionRatioQpackSent",
                             ratio, 1, 200, 200,
                             "Header compression ratio as percentage for sent "
                             "headers using QPACK.");
     } else {
+      QUIC_VLOG(1) << "QPACK headers received compressed: " << compressed
+                   << " uncompressed:" << uncompressed;
       QUIC_HISTOGRAM_COUNTS("QuicSession.HeaderCompressionRatioQpackReceived",
                             ratio, 1, 200, 200,
                             "Header compression ratio as percentage for "