lazy allocation and early release memory in QuicStreamSequencerBuffer. Protected by --quic_reduce_s…

net/quic/core/reliable_quic_stream.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/core/reliable_quic_stream.h"
 
 #include "base/logging.h"
 #include "net/quic/core/iovector.h"
 #include "net/quic/core/quic_bug_tracker.h"
 #include "net/quic/core/quic_flags.h"
@@ skipping 335 matching lines @@
                                ack_notifier_delegate);
 }
 
 void ReliableQuicStream::CloseReadSide() {
   if (read_side_closed_) {
     return;
   }
   DVLOG(1) << ENDPOINT << "Done reading from stream " << id();
 
   read_side_closed_ = true;
+  sequencer_.ReleaseBuffer();
+
   if (write_side_closed_) {
     DVLOG(1) << ENDPOINT << "Closing stream: " << id();
     session_->CloseStream(id());
   }
 }
 
 void ReliableQuicStream::CloseWriteSide() {
   if (write_side_closed_) {
     return;
   }
@@ skipping 96 matching lines @@
   }
 }
 
 void ReliableQuicStream::UpdateSendWindowOffset(QuicStreamOffset new_window) {
   if (flow_controller_.UpdateSendWindowOffset(new_window)) {
     OnCanWrite();
   }
 }
 
 }  // namespace net