Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/hpack/hpack_huffman_table.h

 // Copyright 2014 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_HPACK_HPACK_HUFFMAN_TABLE_H_
 #define NET_SPDY_HPACK_HPACK_HUFFMAN_TABLE_H_
 
 #include <stdint.h>
 
 #include <cstddef>
@@ skipping 76 matching lines @@
   // caller's responsibility to ensure |out| has reserved a sufficient buffer to
   // hold decoded output. GenericDecodeString() halts when |in| runs out of
   // input, in which case true is returned. It also halts (returning false) if
   // an invalid Huffman code prefix is read, or if |out_capacity| would
   // otherwise be overflowed.
   // DEPRECATED: HpackHuffmanDecoder is now used for decoding strings encoded
   // according to the Huffman Table in the HPACK spec.
   bool GenericDecodeString(HpackInputStream* in,
                            std::string* out) const;
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  size_t EstimateMemoryUsage() const;
+
  private:
   // Expects symbols ordered on length & ID ascending.
   void BuildDecodeTables(const std::vector<Symbol>& symbols);
 
   // Expects symbols ordered on ID ascending.
   void BuildEncodeTable(const std::vector<Symbol>& symbols);
 
   // Adds a new DecodeTable with the argument prefix & indexed length.
   // Returns the new table index.
   uint8_t AddDecodeTable(uint8_t prefix, uint8_t indexed);
@@ skipping 16 matching lines @@
   uint8_t pad_bits_;
 
   // If initialization fails, preserve the symbol ID which failed validation
   // for examination in tests.
   uint16_t failed_symbol_id_;
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_HPACK_HPACK_HUFFMAN_TABLE_H_