HTTP2 draft 13: support unknown frame types and settings types as extensions.

net/spdy/spdy_session.cc

Index: net/spdy/spdy_session.cc
diff --git a/net/spdy/spdy_session.cc b/net/spdy/spdy_session.cc
index 64e2c04b2cab2c60421f22e2c4c28925d476e37e..68b893b53e382900fc078639e1c389320fd57f4f 100644
--- a/net/spdy/spdy_session.cc
+++ b/net/spdy/spdy_session.cc
@@ -2321,6 +2321,15 @@ void SpdySession::OnHeaders(SpdyStreamId stream_id,
   }
 }
 
+bool SpdySession::OnUnknownFrame(SpdyStreamId stream_id, int frame_type) {
+  // Validate stream id.
+  // Was the frame sent on a stream id that has not been used in this session?
+  if (stream_id % 2 == 1 && stream_id > stream_hi_water_mark_)
+    return false;
+  // TODO(bnc):  Track highest id for server initiated streams.
+  return true;
+}
+
 void SpdySession::OnRstStream(SpdyStreamId stream_id,
                               SpdyRstStreamStatus status) {
   CHECK(in_io_loop_);