Plumbing for TCP FastOpen for SSL sockets.

net/socket/stream_socket.h

Index: net/socket/stream_socket.h
diff --git a/net/socket/stream_socket.h b/net/socket/stream_socket.h
index 72088103a3d7669f30dd3151da55b975f6f4245c..43a31e388924086f174712258683e4e2ad2b2cc1 100644
--- a/net/socket/stream_socket.h
+++ b/net/socket/stream_socket.h
@@ -79,6 +79,9 @@ class NET_EXPORT_PRIVATE StreamSocket : public Socket {
   // TCP FastOpen is an experiment with sending data in the TCP SYN packet.
   virtual bool UsingTCPFastOpen() const = 0;
 
+  // Enables use of TCP FastOpen for the underlying transport socket.
+  virtual void EnableTCPFastOpen() {}

[Randy Smith (Not in Mondays), 2014/08/11 19:07:01]

I dislike the idea of the stream socket abstraction knowing about the TCP Fast
Open concept.  I'd instead rather have this be "EnableIdempotentFirstWrite" or
"EnableConnectionWriteCombination" or something similarly abstract.  You can
turn that into enabling fast open for the concrete sockets for which it makes
sense.

+
   // Returns true if NPN was negotiated during the connection of this socket.
   virtual bool WasNpnNegotiated() const = 0;