Create an interface for explicit notification of Dispatcher about

net/tools/quic/quic_server_session.h

Index: net/tools/quic/quic_server_session.h
diff --git a/net/tools/quic/quic_server_session.h b/net/tools/quic/quic_server_session.h
index 7722294c581d0c35543351570a1061e8318be2fd..288cc6859e31f2e5f35d9f57ba927d3954eee978 100644
--- a/net/tools/quic/quic_server_session.h
+++ b/net/tools/quic/quic_server_session.h
@@ -19,6 +19,7 @@
 
 namespace net {
 
+class QuicBlockedWriterInterface;
 class QuicConfig;
 class QuicConnection;
 class QuicCryptoServerConfig;
@@ -32,22 +33,24 @@ class QuicServerSessionPeer;
 
 // An interface from the session to the entity owning the session.
 // This lets the session notify its owner (the Dispatcher) when the connection
-// is closed.
-class QuicSessionOwner {
+// is closed or blocked.
+class QuicServerSessionVisitor {
  public:
-  virtual ~QuicSessionOwner() {}
+  virtual ~QuicServerSessionVisitor() {}
 
   virtual void OnConnectionClosed(QuicGuid guid, QuicErrorCode error) = 0;
+  virtual void OnWriteBlocked(QuicBlockedWriterInterface* writer) = 0;
 };
 
 class QuicServerSession : public QuicSession {
  public:
   QuicServerSession(const QuicConfig& config,
                     QuicConnection *connection,
-                    QuicSessionOwner* owner);
+                    QuicServerSessionVisitor* visitor);
 
   // Override the base class to notify the owner of the connection close.
   virtual void OnConnectionClosed(QuicErrorCode error, bool from_peer) OVERRIDE;
+  virtual void OnWriteBlocked() OVERRIDE;
 
   virtual ~QuicServerSession();
 
@@ -75,7 +78,7 @@ class QuicServerSession : public QuicSession {
   friend class test::QuicServerSessionPeer;
 
   scoped_ptr<QuicCryptoServerStream> crypto_stream_;
-  QuicSessionOwner* owner_;
+  QuicServerSessionVisitor* visitor_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicServerSession);
 };