Adds QUIC_VERSION_36 which adds support to force HOL blocking between streams for measurement purpo…

net/quic/quic_spdy_stream.h

Index: net/quic/quic_spdy_stream.h
diff --git a/net/quic/quic_spdy_stream.h b/net/quic/quic_spdy_stream.h
index 86d69a8ede43a074207ca61d45af70909d3c9a1b..01f7a29a4579c6c3b7939fbef3899f155e31c8a2 100644
--- a/net/quic/quic_spdy_stream.h
+++ b/net/quic/quic_spdy_stream.h
@@ -210,6 +210,14 @@ class NET_EXPORT_PRIVATE QuicSpdyStream : public ReliableQuicStream {
   // Returns true if headers have been fully read and consumed.
   bool FinishedReadingHeaders() const;
 
+  // Redirects to the headers stream if force HOL blocking enabled,
+  // otherwise just pass through.
+  QuicConsumedData WritevDataInner(
+      QuicIOVector iov,
+      QuicStreamOffset offset,
+      bool fin,
+      QuicAckListenerInterface* ack_notifier_delegate) override;
+
  private:
   friend class test::QuicSpdyStreamPeer;
   friend class test::ReliableQuicStreamPeer;