Sent QUIC "PING" frames when a stream is open and the connection

net/quic/quic_session.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.
 //
 // A QuicSession, which demuxes a single connection to individual streams.
 
 #ifndef NET_QUIC_QUIC_SESSION_H_
 #define NET_QUIC_QUIC_SESSION_H_
 
 #include <vector>
@@ skipping 55 matching lines @@
       const std::vector<QuicWindowUpdateFrame>& frames) OVERRIDE;
   virtual void OnBlockedFrames(
       const std::vector<QuicBlockedFrame>& frames) OVERRIDE;
   virtual void OnConnectionClosed(QuicErrorCode error, bool from_peer) OVERRIDE;
   virtual void OnWriteBlocked() OVERRIDE {}
   virtual void OnSuccessfulVersionNegotiation(
       const QuicVersion& version) OVERRIDE {}
   virtual void OnCanWrite() OVERRIDE;
   virtual bool HasPendingWrites() const OVERRIDE;
   virtual bool HasPendingHandshake() const OVERRIDE;
+  virtual bool HasOpenDataStreams() const OVERRIDE;
 
   // Called by the headers stream when headers have been received for a stream.
   virtual void OnStreamHeaders(QuicStreamId stream_id,
                                base::StringPiece headers_data);
   // Called by the headers stream when headers with a priority have been
   // received for this stream.  This method will only be called for server
   // streams.
   virtual void OnStreamHeadersPriority(QuicStreamId stream_id,
                                        QuicPriority priority);
   // Called by the headers stream when headers have been completely received
@@ skipping 82 matching lines @@
   const IPEndPoint& peer_address() const {
     return connection_->peer_address();
   }
   QuicConnectionId connection_id() const {
     return connection_->connection_id();
   }
 
   QuicPacketCreator::Options* options() { return connection()->options(); }
 
   // Returns the number of currently open streams, including those which have
-  // been implicitly created.
+  // been implicitly created, but excluding the reserved headers and crypto
+  // streams.
   virtual size_t GetNumOpenStreams() const;
 
   void MarkWriteBlocked(QuicStreamId id, QuicPriority priority);
 
   // Returns true if the session has data to be sent, either queued in the
   // connection, or in a write-blocked stream.
   bool HasDataToWrite() const;
 
   bool goaway_received() const {
     return goaway_received_;
@@ skipping 103 matching lines @@
 
   // Indicate if there is pending data for the crypto stream.
   bool has_pending_handshake_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicSession);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SESSION_H_