Add a queued_data_bytes() method to ReliableQuicStream. Not used outside of tests.

net/quic/reliable_quic_stream.cc

Index: net/quic/reliable_quic_stream.cc
diff --git a/net/quic/reliable_quic_stream.cc b/net/quic/reliable_quic_stream.cc
index 03c6214581908b9f8d692a0b9bb62d09e61379c9..2682d5b84a865730a017f9d0a99c11947104b4eb 100644
--- a/net/quic/reliable_quic_stream.cc
+++ b/net/quic/reliable_quic_stream.cc
@@ -52,7 +52,8 @@ ReliableQuicStream::PendingData::~PendingData() {
 }
 
 ReliableQuicStream::ReliableQuicStream(QuicStreamId id, QuicSession* session)
-    : sequencer_(this, session->connection()->clock()),
+    : queued_data_bytes_(0),
+      sequencer_(this, session->connection()->clock()),
       id_(id),
       session_(session),
       stream_bytes_read_(0),
@@ -216,6 +217,7 @@ void ReliableQuicStream::WriteOrBufferData(
   if (consumed_data.bytes_consumed < data.length() ||
       (fin && !consumed_data.fin_consumed)) {
     StringPiece remainder(data.substr(consumed_data.bytes_consumed));
+    queued_data_bytes_ += remainder.size();
     queued_data_.push_back(PendingData(remainder.as_string(), ack_listener));
   }
 }
@@ -242,6 +244,7 @@ void ReliableQuicStream::OnCanWrite() {
         const_cast<char*>(pending_data->data.data()) + pending_data->offset,
         remaining_len};
     QuicConsumedData consumed_data = WritevData(&iov, 1, fin, ack_listener);
+    queued_data_bytes_ -= consumed_data.bytes_consumed;
     if (consumed_data.bytes_consumed == remaining_len &&
         fin == consumed_data.fin_consumed) {
       queued_data_.pop_front();