Optionally defer responding to a QUIC ACK until all ACK processing has completed for an EpollServer…

net/quic/quic_connection.h

Index: net/quic/quic_connection.h
diff --git a/net/quic/quic_connection.h b/net/quic/quic_connection.h
index 72f0272173680a77dd7838e47cd5090735f22359..fa17503223d0c167d29881e76fd0274390719c74 100644
--- a/net/quic/quic_connection.h
+++ b/net/quic/quic_connection.h
@@ -414,6 +414,10 @@ class NET_EXPORT_PRIVATE QuicConnection
   // If the socket is not blocked, writes queued packets.
   void WriteIfNotBlocked();
 
+  // If the socket is not blocked, writes queued packets and bundles any pending
+  // ACKs.
+  void WriteAndBundleAcksIfNotBlocked();
+
   // Set the packet writer.
   void SetQuicPacketWriter(QuicPacketWriter* writer, bool owns_writer) {
     DCHECK(writer != nullptr);
@@ -713,6 +717,13 @@ class NET_EXPORT_PRIVATE QuicConnection
     per_packet_options_ = options;
   }
 
+  // If |defer| is true, configures the connection to defer sending packets in
+  // response to an ACK to the SendAlarm. If |defer| is false, packets may be
+  // sent immediately after receiving an ACK.
+  void set_defer_send_in_response_to_packets(bool defer) {
+    defer_send_in_response_to_packets_ = defer;
+  }
+
  private:
   friend class test::QuicConnectionPeer;
   friend class test::PacketSavingConnection;
@@ -937,6 +948,10 @@ class NET_EXPORT_PRIVATE QuicConnection
   // Indicates the retransmission alarm needs to be set.
   bool pending_retransmission_alarm_;
 
+  // If true, defer sending data in response to received packets to the
+  // SendAlarm.
+  bool defer_send_in_response_to_packets_;
+
   // Arena to store class implementations within the QuicConnection.
   QuicConnectionArena arena_;