Update from https://crrev.com/302630

net/quic/quic_session.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/quic_session.h"
 
 #include "base/stl_util.h"
 #include "net/quic/crypto/proof_verifier.h"
 #include "net/quic/quic_connection.h"
 #include "net/quic/quic_flags.h"
@@ skipping 30 matching lines @@
   void OnRstStream(const QuicRstStreamFrame& frame) override {
     session_->OnRstStream(frame);
     session_->PostProcessAfterData();
   }
 
   void OnGoAway(const QuicGoAwayFrame& frame) override {
     session_->OnGoAway(frame);
     session_->PostProcessAfterData();
   }
 
-  void OnWindowUpdateFrames(
-      const vector<QuicWindowUpdateFrame>& frames) override {
+  void OnWindowUpdateFrames(const vector<QuicWindowUpdateFrame>& frames)
+      override {
     session_->OnWindowUpdateFrames(frames);
     session_->PostProcessAfterData();
   }
 
   void OnBlockedFrames(const vector<QuicBlockedFrame>& frames) override {
     session_->OnBlockedFrames(frames);
     session_->PostProcessAfterData();
   }
 
   void OnCanWrite() override {
@@ skipping 358 matching lines @@
   // of the how many bytes the stream's flow controller believes it has
   // received, for accurate connection level flow control accounting.
   if (!stream->HasFinalReceivedByteOffset() &&
       stream->flow_controller()->IsEnabled()) {
     locally_closed_streams_highest_offset_[stream_id] =
         stream->flow_controller()->highest_received_byte_offset();
   }
 
   stream_map_.erase(it);
   stream->OnClose();
+  // Decrease the number of streams being emulated when a new one is opened.
+  connection_->SetNumOpenStreams(stream_map_.size());
 }
 
 void QuicSession::UpdateFlowControlOnFinalReceivedByteOffset(
     QuicStreamId stream_id, QuicStreamOffset final_byte_offset) {
   map<QuicStreamId, QuicStreamOffset>::iterator it =
       locally_closed_streams_highest_offset_.find(stream_id);
   if (it == locally_closed_streams_highest_offset_.end()) {
     return;
   }
 
@@ skipping 147 matching lines @@
 
 QuicConfig* QuicSession::config() {
   return &config_;
 }
 
 void QuicSession::ActivateStream(QuicDataStream* stream) {
   DVLOG(1) << ENDPOINT << "num_streams: " << stream_map_.size()
            << ". activating " << stream->id();
   DCHECK_EQ(stream_map_.count(stream->id()), 0u);
   stream_map_[stream->id()] = stream;
+  // Increase the number of streams being emulated when a new one is opened.
+  connection_->SetNumOpenStreams(stream_map_.size());
 }
 
 QuicStreamId QuicSession::GetNextStreamId() {
   QuicStreamId id = next_stream_id_;
   next_stream_id_ += 2;
   return id;
 }
 
 ReliableQuicStream* QuicSession::GetStream(const QuicStreamId stream_id) {
   if (stream_id == kCryptoStreamId) {
@@ skipping 176 matching lines @@
   for (DataStreamMap::iterator it = stream_map_.begin();
        it != stream_map_.end(); ++it) {
     if (it->second->flow_controller()->IsBlocked()) {
       return true;
     }
   }
   return false;
 }
 
 }  // namespace net