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

net/tools/flip_server/spdy_interface.h

Index: net/tools/flip_server/spdy_interface.h
diff --git a/net/tools/flip_server/spdy_interface.h b/net/tools/flip_server/spdy_interface.h
index e472cf2ac59e135830e236530673eded0b2adb9f..21742744374cc949d62654e02ed6a0b3aed47cb2 100644
--- a/net/tools/flip_server/spdy_interface.h
+++ b/net/tools/flip_server/spdy_interface.h
@@ -130,6 +130,8 @@ class SpdySM : public BufferedSpdyFramerVisitorInterface, public SMInterface {
                              SpdyStreamId promised_stream_id,
                              const SpdyHeaderBlock& headers) OVERRIDE {}
 
+  virtual bool OnUnknownFrame(SpdyStreamId stream_id, int frame_type) OVERRIDE;
+
  public:
   virtual size_t ProcessReadInput(const char* data, size_t len) OVERRIDE;
   virtual size_t ProcessWriteInput(const char* data, size_t len) OVERRIDE;