Plumbing for TCP FastOpen for SSL sockets.

net/socket/transport_client_socket_pool.cc

Index: net/socket/transport_client_socket_pool.cc
diff --git a/net/socket/transport_client_socket_pool.cc b/net/socket/transport_client_socket_pool.cc
index 7527eca52edf547d3e75a102bf8b79374ba846a8..0ad63aa17442b89d21bef59cce06dfeb3a48ebaa 100644
--- a/net/socket/transport_client_socket_pool.cc
+++ b/net/socket/transport_client_socket_pool.cc
@@ -25,6 +25,8 @@
 #include "net/socket/tcp_client_socket.h"
 
 using base::TimeDelta;
+extern bool g_tcp_fastopen_user_enabled;
+extern bool g_tcp_fastopen_supported;

[mmenke, 2014/09/05 19:36:42]

These values don't exist on windows.  Also, think it makes more sense just to
add accessors (And put them in an anonymous namespace in the other file), rather
than using externs.

 
 namespace net {
 
@@ -60,12 +62,22 @@ TransportSocketParams::TransportSocketParams(
     const HostPortPair& host_port_pair,
     bool disable_resolver_cache,
     bool ignore_limits,
-    const OnHostResolutionCallback& host_resolution_callback)
+    const OnHostResolutionCallback& host_resolution_callback,
+    AutoConnectWithWritePolicy auto_connect_with_write_if_supported)
     : destination_(host_port_pair),
       ignore_limits_(ignore_limits),
-      host_resolution_callback_(host_resolution_callback) {
+      host_resolution_callback_(host_resolution_callback),
+      auto_connect_with_write_(auto_connect_with_write_if_supported) {
   if (disable_resolver_cache)
     destination_.set_allow_cached_response(false);
+  // Auto-connect currently translates to only TCP Fast Open.
+  // Enable TCP FastOpen if user wants it and system supports it.
+  if (!g_tcp_fastopen_supported)
+    auto_connect_with_write_ = AUTO_CONNECT_DISABLED;

[mmenke, 2014/09/05 19:36:42]

This isn't needed - we already have a check that it's supported before enabling
it.

+  else
+    if (g_tcp_fastopen_user_enabled &&
+        auto_connect_with_write_ == AUTO_CONNECT_USE_DEFAULT)
+      auto_connect_with_write_ = AUTO_CONNECT_ENABLED;
 }
 
 TransportSocketParams::~TransportSocketParams() {}
@@ -261,6 +273,10 @@ int TransportConnectJob::DoTransportConnect() {
   transport_socket_ =
       helper_.client_socket_factory()->CreateTransportClientSocket(
           helper_.addresses(), net_log().net_log(), net_log().source());
+
+  if (helper_.params()->auto_connect_with_write() == AUTO_CONNECT_ENABLED)
+    transport_socket_->EnableTCPFastOpen();
+
   int rv = transport_socket_->Connect(helper_.on_io_complete());
   if (rv == ERR_IO_PENDING &&
       helper_.addresses().front().GetFamily() == ADDRESS_FAMILY_IPV6 &&