SPDY: Add a bunch of CHECKs into SpdyWriteQueue to detect re-entrancy.

net/spdy/spdy_write_queue.h

 // Copyright (c) 2013 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_SPDY_SPDY_WRITE_QUEUE_H_
 #define NET_SPDY_SPDY_WRITE_QUEUE_H_
 
 #include <deque>
 
 #include "base/basictypes.h"
@@ skipping 60 matching lines @@
     // Whether |stream| was non-NULL when enqueued.
     bool has_stream;
 
     PendingWrite();
     PendingWrite(SpdyFrameType frame_type,
                  SpdyBufferProducer* frame_producer,
                  const base::WeakPtr<SpdyStream>& stream);
     ~PendingWrite();
   };
 
+  bool removing_writes_;
+
   // The actual write queue, binned by priority.
   std::deque<PendingWrite> queue_[NUM_PRIORITIES];
 
   DISALLOW_COPY_AND_ASSIGN(SpdyWriteQueue);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_SPDY_WRITE_QUEUE_H_