Create an interface for explicit notification of Dispatcher about

net/quic/quic_connection.h

 // 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.
 //
 // The entity that handles framing writes for a Quic client or server.
 // Each QuicSession will have a connection associated with it.
 //
 // On the server side, the Dispatcher handles the raw reads, and hands off
 // packets via ProcessUdpPacket for framing and processing.
 //
@@ skipping 57 matching lines @@
   virtual bool OnStreamFrames(const std::vector<QuicStreamFrame>& frames) = 0;
 
   // Called when the stream is reset by the peer.
   virtual void OnRstStream(const QuicRstStreamFrame& frame) = 0;
 
   // Called when the connection is going away according to the peer.
   virtual void OnGoAway(const QuicGoAwayFrame& frame) = 0;
 
   // Called when the connection is closed either locally by the framer, or
   // remotely by the peer.
-  virtual void OnConnectionClosed(QuicErrorCode error,
-                                  bool from_peer) = 0;
+  virtual void OnConnectionClosed(QuicErrorCode error, bool from_peer) = 0;
+
+  // Called when the connection failed to write because the socket was blocked.
+  virtual void OnWriteBlocked() = 0;
 
   // Called once a specific QUIC version is agreed by both endpoints.
   virtual void OnSuccessfulVersionNegotiation(const QuicVersion& version) = 0;
 
   // Indicates a new QuicConfig has been negotiated.
   virtual void OnConfigNegotiated() = 0;
 
   // Called when a blocked socket becomes writable.  If all pending bytes for
   // this visitor are consumed by the connection successfully this should
   // return true, otherwise it should return false.
@@ skipping 621 matching lines @@
   // If non-empty this contains the set of versions received in a
   // version negotiation packet.
   QuicVersionVector server_supported_versions_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicConnection);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CONNECTION_H_