Add extra log when CHLO is considered not fit in one packet.

net/quic/quic_packet_creator.cc

Index: net/quic/quic_packet_creator.cc
diff --git a/net/quic/quic_packet_creator.cc b/net/quic/quic_packet_creator.cc
index 26411f26dda8d84c3b1e57018a7affdb32d4cdee..d66f565817110c0cebc80f627c680abbc4ecd03f 100644
--- a/net/quic/quic_packet_creator.cc
+++ b/net/quic/quic_packet_creator.cc
@@ -174,7 +174,9 @@ bool QuicPacketCreator::ConsumeData(QuicStreamId id,
     DCHECK_EQ(static_cast<size_t>(0), iov_offset);
     if (frame->stream_frame->data_length < iov.iov->iov_len) {
       const string error_details = "Client hello won't fit in a single packet.";
-      QUIC_BUG << error_details;
+      QUIC_BUG << error_details << " Constructed stream frame length: "
+               << frame->stream_frame->data_length
+               << " CHLO length: " << iov.iov->iov_len;
       delegate_->OnUnrecoverableError(QUIC_CRYPTO_CHLO_TOO_LARGE, error_details,
                                       ConnectionCloseSource::FROM_SELF);
       delete frame->stream_frame;