[SPDY] Add flag to turn on SPDY/3.1 (with per-session flow control)

net/http/http_stream_factory.h

Index: net/http/http_stream_factory.h
diff --git a/net/http/http_stream_factory.h b/net/http/http_stream_factory.h
index 5f6ef2f8265fabf07ec887020a1ba5e3ef8cbf5b..a0355ae84652c43c20df029a5206e227a21cb623 100644
--- a/net/http/http_stream_factory.h
+++ b/net/http/http_stream_factory.h
@@ -239,6 +239,10 @@ class NET_EXPORT HttpStreamFactory {
   // Sets http/1.1, spdy/2, and spdy/3 as the protocols supported via NPN.
   static void EnableNpnSpdy3();
 
+  // Sets http/1.1, spdy/2, spdy/3, and spdy/3.1 as the protocols
+  // supported via NPN.
+  static void EnableNpnSpdy31();
+
   // Sets the protocols supported by NPN (next protocol negotiation) during the
   // SSL handshake as well as by HTTP Alternate-Protocol.
   static void SetNextProtos(const std::vector<std::string>& value);