Replace QUIC's PathMtuAckListener with a non-AckListener approach. Protected by FLAGS_quic_no_mtu_d…

net/quic/quic_sent_packet_manager_interface.h

 // Copyright 2016 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.
 
 #ifndef NET_QUIC_QUIC_SENT_PACKET_MANAGER_INTERFACE_H_
 #define NET_QUIC_QUIC_SENT_PACKET_MANAGER_INTERFACE_H_
 
 #include "base/macros.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_sustained_bandwidth_recorder.h"
@@ skipping 36 matching lines @@
     virtual ~NetworkChangeVisitor() {}
 
     // Called when congestion window or RTT may have changed.
     virtual void OnCongestionChange() = 0;
 
     // Called with the path may be degrading. Note that the path may only be
     // temporarily degrading.
     // TODO(jri): With multipath, this method should probably have a path_id
     // parameter, and should maybe result in the path being marked as inactive.
     virtual void OnPathDegrading() = 0;
+
+    // Called when the Path MTU may have increased.
+    virtual void OnPathMtuIncreased(QuicPacketLength packet_size) = 0;
   };
 
   virtual ~QuicSentPacketManagerInterface() {}
 
   virtual void SetFromConfig(const QuicConfig& config) = 0;
 
   // Resumes connection state on the default path.
   virtual void ResumeConnectionState(
       const CachedNetworkParameters& cached_network_params,
       bool max_bandwidth_resumption) = 0;
@@ skipping 118 matching lines @@
 
   // These two methods return the consecutive RTO or TLP count of the default
   // path.
   virtual size_t GetConsecutiveRtoCount() const = 0;
   virtual size_t GetConsecutiveTlpCount() const = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SENT_PACKET_MANAGER_INTERFACE_H_