Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/hpack/hpack_header_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_HEADER_TABLE_H_
 #define NET_SPDY_HPACK_HPACK_HEADER_TABLE_H_
 
 #include <cstddef>
 #include <deque>
 #include <memory>
@@ skipping 107 matching lines @@
   // evicted and the empty table is of insufficent size for the representation.
   const HpackEntry* TryAddEntry(base::StringPiece name,
                                 base::StringPiece value);
 
   void DebugLogTableState() const;
 
   void set_debug_visitor(std::unique_ptr<DebugVisitorInterface> visitor) {
     debug_visitor_ = std::move(visitor);
   }
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  size_t EstimateMemoryUsage() const;
+
  private:
   // Returns number of evictions required to enter |name| & |value|.
   size_t EvictionCountForEntry(base::StringPiece name,
                                base::StringPiece value) const;
 
   // Returns number of evictions required to reclaim |reclaim_size| table size.
   size_t EvictionCountToReclaim(size_t reclaim_size) const;
 
   // Evicts |count| oldest entries from the table.
   void Evict(size_t count);
@@ skipping 29 matching lines @@
   size_t total_insertions_;
 
   std::unique_ptr<DebugVisitorInterface> debug_visitor_;
 
   DISALLOW_COPY_AND_ASSIGN(HpackHeaderTable);
 };
 
 }  // namespace net
 
 #endif  // NET_SPDY_HPACK_HPACK_HEADER_TABLE_H_