Plumbing for TCP FastOpen for SSL sockets.

net/socket/tcp_socket.h

Index: net/socket/tcp_socket.h
diff --git a/net/socket/tcp_socket.h b/net/socket/tcp_socket.h
index 8b36fade758e05db222d9fa4e2ee739e110b2779..e7a4ab0b978d6c66d64b949dc8f865967f712320 100644
--- a/net/socket/tcp_socket.h
+++ b/net/socket/tcp_socket.h
@@ -16,13 +16,17 @@
 
 namespace net {
 
-// Enable/disable experimental TCP FastOpen option.
-// Not thread safe.  Must be called during initialization/startup only.
-NET_EXPORT void SetTCPFastOpenEnabled(bool value);
+// Check if TCP FastOpen option is supported by the OS.
+bool IsTCPFastOpenSupported();
 
-// Check if the TCP FastOpen option is enabled.
+// Check if TCP FastOpen option is enabled.
 bool IsTCPFastOpenEnabled();
 
+// Checks if TCP FastOpen is supported by the kernel. Also enables TFO for all
+// connections if indicated by user.
+// Not thread safe.  Must be called during initialization/startup only.
+NET_EXPORT void CheckSupportAndMaybeEnableTCPFastOpen(bool user_enabled);
+
 // TCPSocket provides a platform-independent interface for TCP sockets.
 //
 // It is recommended to use TCPClientSocket/TCPServerSocket instead of this