Ensure that BidirectionalStreamQuicImpl does not synchronously invoke callbacks

net/quic/chromium/bidirectional_stream_quic_impl.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_CHROMIUM_BIDIRECTIONAL_STREAM_QUIC_IMPL_H_
 #define NET_QUIC_CHROMIUM_BIDIRECTIONAL_STREAM_QUIC_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 113 matching lines @@
   bool closed_is_first_stream_;
   // Indicates whether initial headers have been sent.
   bool has_sent_headers_;
 
   // Whether to automatically send request headers when stream is negotiated.
   // If false, headers will not be sent until SendRequestHeaders() is called or
   // until next SendData/SendvData, during which QUIC will try to combine header
   // frame with data frame in the same packet if possible.
   bool send_request_headers_automatically_;
 
+  // True when callbacks to the delegate may be invoked synchronously.
+  bool may_invoke_callbacks_;
+
   base::WeakPtrFactory<BidirectionalStreamQuicImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BidirectionalStreamQuicImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CHROMIUM_BIDIRECTIONAL_STREAM_QUIC_IMPL_H_