Allow large response headers to buffer in HpackDecoder.

net/spdy/chromium/header_coalescer.h

 // Copyright (c) 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_SPDY_CHROMIUM_HEADER_COALESCER_H_
 #define NET_SPDY_CHROMIUM_HEADER_COALESCER_H_
 
 #include "net/base/net_export.h"
 #include "net/log/net_log_with_source.h"
 #include "net/spdy/core/spdy_header_block.h"
 #include "net/spdy/core/spdy_headers_handler_interface.h"
 #include "net/spdy/platform/api/spdy_string_piece.h"
 
 namespace net {
 
+const size_t kMaxHeaderListSize = 256 * 1024;
+
 class NET_EXPORT_PRIVATE HeaderCoalescer : public SpdyHeadersHandlerInterface {
  public:
   explicit HeaderCoalescer(const NetLogWithSource& net_log);
 
   void OnHeaderBlockStart() override {}
 
   void OnHeader(SpdyStringPiece key, SpdyStringPiece value) override;
 
   void OnHeaderBlockEnd(size_t uncompressed_header_bytes,
                         size_t compressed_header_bytes) override {}
@@ skipping 12 matching lines @@
   bool headers_valid_ = true;
   size_t header_list_size_ = 0;
   bool error_seen_ = false;
   bool regular_header_seen_ = false;
   NetLogWithSource net_log_;
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_CHROMIUM_HEADER_COALESCER_H_