Consult only stream map for gQUIC in QuicSession::GetNumActiveStreams().

Protected by  gfe2_reloadable_flag_quic_get_stream_information_from_stream_map

PiperOrigin-RevId: 324887981
Change-Id: I560062234d5c9e6dadb770732e3159b1b77cd52b

quic/core/http/quic_spdy_session.cc

diff --git a/quic/core/http/quic_spdy_session.cc b/quic/core/http/quic_spdy_session.cc
index 90304c0..c1b7661 100644
--- a/quic/core/http/quic_spdy_session.cc
+++ b/quic/core/http/quic_spdy_session.cc
@@ -844,10 +844,8 @@
 
 // True if there are open HTTP requests.
 bool QuicSpdySession::ShouldKeepConnectionAlive() const {
-  if (!VersionUsesHttp3(transport_version())) {
-    DCHECK(pending_streams().empty());
-  }
-  return GetNumActiveStreams() + pending_streams().size() > 0;
+  DCHECK(VersionUsesHttp3(transport_version()) || 0u == pending_streams_size());
+  return GetNumActiveStreams() + pending_streams_size() > 0;
 }
 
 bool QuicSpdySession::UsesPendingStreams() const {

quic/core/quic_session.cc

diff --git a/quic/core/quic_session.cc b/quic/core/quic_session.cc
index ecfb2b2..f68a9cb 100644
--- a/quic/core/quic_session.cc
+++ b/quic/core/quic_session.cc
@@ -2017,13 +2017,17 @@
 }
 
 size_t QuicSession::GetNumActiveStreams() const {
-  if (!VersionHasIetfQuicFrames(transport_version())) {
+  if (!VersionHasIetfQuicFrames(transport_version()) &&
+      !GetQuicReloadableFlag(quic_get_stream_information_from_stream_map)) {
     // Exclude locally_closed_streams when determine whether to keep connection
     // alive.
     return stream_id_manager_.num_open_incoming_streams() +
            stream_id_manager_.num_open_outgoing_streams() -
            locally_closed_streams_highest_offset_.size();
   }
+  if (GetQuicReloadableFlag(quic_get_stream_information_from_stream_map)) {
+    QUIC_RELOADABLE_FLAG_COUNT(quic_get_stream_information_from_stream_map);
+  }
   DCHECK_GE(static_cast<QuicStreamCount>(stream_map_.size()),
             num_static_streams_ + num_draining_streams_ + num_zombie_streams_);
   return stream_map_.size() - num_draining_streams_ - num_static_streams_ -

quic/core/quic_session.h

diff --git a/quic/core/quic_session.h b/quic/core/quic_session.h
index 0f53f09..9bb05ff 100644
--- a/quic/core/quic_session.h
+++ b/quic/core/quic_session.h
@@ -570,9 +570,7 @@
   // TODO(b/136274541): remove this getter and only expose GetNumActiveStreams()
   size_t stream_map_size() const { return stream_map_.size(); }
 
-  const PendingStreamMap& pending_streams() const {
-    return pending_stream_map_;
-  }
+  size_t pending_streams_size() const { return pending_stream_map_.size(); }
 
   ClosedStreams* closed_streams() { return &closed_streams_; }