Plumbing for TCP FastOpen for SSL sockets.

net/socket/tcp_socket_libevent.cc

Index: net/socket/tcp_socket_libevent.cc
diff --git a/net/socket/tcp_socket_libevent.cc b/net/socket/tcp_socket_libevent.cc
index 444e3c04231ce3f5279e56dad7e43d557d7bc86e..5bab98e8d88816833b72587d3f838e55dcb575c7 100644
--- a/net/socket/tcp_socket_libevent.cc
+++ b/net/socket/tcp_socket_libevent.cc
@@ -369,6 +369,11 @@ bool TCPSocketLibevent::UsingTCPFastOpen() const {
   return use_tcp_fastopen_;
 }
 
+void TCPSocketLibevent::EnableTCPFastOpen() {
+  if (!use_tcp_fastopen_ && IsTCPFastOpenSupported())
+    use_tcp_fastopen_ = true;
+}
+
 bool TCPSocketLibevent::IsValid() const {
   return socket_ != NULL && socket_->socket_fd() != kInvalidSocket;
 }
@@ -495,7 +500,7 @@ void TCPSocketLibevent::ReadCompleted(const scoped_refptr<IOBuffer>& buf,
                                       const CompletionCallback& callback,
                                       int rv) {
   DCHECK_NE(ERR_IO_PENDING, rv);
-  // Records fast open status regardless of error in asynchronous case.
+  // Records TCP FastOpen status regardless of error in asynchronous case.
   // TODO(rdsmith,jri): Change histogram name to indicate it could be called on
   // error.
   RecordFastOpenStatus();
@@ -597,7 +602,7 @@ void TCPSocketLibevent::RecordFastOpenStatus() {
     bool getsockopt_success(false);
     bool server_acked_data(false);
 #if defined(TCP_INFO)
-    // Probe to see the if the socket used TCP Fast Open.
+    // Probe to see the if the socket used TCP FastOpen.
     tcp_info info;
     socklen_t info_len = sizeof(tcp_info);
     getsockopt_success =