[SPDY] Add flag and about:flags entry for SPDY/4 alpha 1

net/spdy/spdy_session.h

Index: net/spdy/spdy_session.h
diff --git a/net/spdy/spdy_session.h b/net/spdy/spdy_session.h
index 0e1ca2d9f21201761be09946a9ee11c58e873609..88496839a2b495e845e8c8b80b7bf5765e7b8329 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -22,6 +22,7 @@
 #include "net/base/net_errors.h"
 #include "net/base/request_priority.h"
 #include "net/socket/client_socket_handle.h"
+#include "net/socket/next_proto.h"
 #include "net/socket/ssl_client_socket.h"
 #include "net/socket/stream_socket.h"
 #include "net/spdy/buffered_spdy_framer.h"
@@ -456,6 +457,7 @@ class NET_EXPORT SpdySession : public base::RefCounted<SpdySession>,
   FRIEND_TEST_ALL_PREFIXES(SpdySessionSpdy3Test, DeleteExpiredPushStreams);
   FRIEND_TEST_ALL_PREFIXES(SpdySessionSpdy3Test, ProtocolNegotiation);
   FRIEND_TEST_ALL_PREFIXES(SpdySessionSpdy3Test, ProtocolNegotiation31);
+  FRIEND_TEST_ALL_PREFIXES(SpdySessionSpdy3Test, ProtocolNegotiation4);
   FRIEND_TEST_ALL_PREFIXES(SpdySessionSpdy3Test, IncreaseRecvWindowSize);
   FRIEND_TEST_ALL_PREFIXES(SpdySessionSpdy3Test, AdjustRecvWindowSize31);
   FRIEND_TEST_ALL_PREFIXES(SpdySessionSpdy3Test, AdjustSendWindowSize31);