Adds ability to disable connection pooling in QUIC.

net/quic/quic_stream_factory.cc

Index: net/quic/quic_stream_factory.cc
diff --git a/net/quic/quic_stream_factory.cc b/net/quic/quic_stream_factory.cc
index 35c695563b1631ddd1a36fc871d611a5f3a7016d..74b3aeb94b9ddcf933ef796a762820a61ef2b7a2 100644
--- a/net/quic/quic_stream_factory.cc
+++ b/net/quic/quic_stream_factory.cc
@@ -482,6 +482,7 @@ QuicStreamFactory::QuicStreamFactory(
     bool enable_port_selection,
     bool enable_time_based_loss_detection,
     bool always_require_handshake_confirmation,
+    bool disable_connection_pooling,
     const QuicTagVector& connection_options)
     : require_confirmation_(true),
       host_resolver_(host_resolver),
@@ -499,6 +500,7 @@ QuicStreamFactory::QuicStreamFactory(
       enable_port_selection_(enable_port_selection),
       always_require_handshake_confirmation_(
           always_require_handshake_confirmation),
+      disable_connection_pooling_(disable_connection_pooling),
       port_seed_(random_generator_->RandUint64()),
       weak_factory_(this) {
   DCHECK(transport_security_state_);
@@ -580,6 +582,9 @@ bool QuicStreamFactory::OnResolution(
     const QuicServerId& server_id,
     const AddressList& address_list) {
   DCHECK(!HasActiveSession(server_id));
+  if (disable_connection_pooling_) {
+    return false;
+  }
   for (size_t i = 0; i < address_list.size(); ++i) {
     const IPEndPoint& address = address_list[i];
     const IpAliasKey ip_alias_key(address, server_id.is_https());