Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/hpack/hpack_decoder2.cc

 // 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.
 
 #include "net/spdy/hpack/hpack_decoder2.h"
 
 #include <list>
 #include <utility>
 
 #include "base/logging.h"
 #include "base/strings/string_piece.h"
+#include "base/trace_event/memory_usage_estimator.h"
 #include "net/http2/decoder/decode_buffer.h"
 #include "net/http2/decoder/decode_status.h"
 #include "net/spdy/hpack/hpack_entry.h"
 
 using base::StringPiece;
 
 namespace net {
 
 HpackDecoder2::HpackDecoder2() : hpack_block_decoder_(this) {
   Reset();
@@ skipping 130 matching lines @@
   DVLOG(2) << "HpackDecoder2::SetHeaderTableDebugVisitor";
   header_table_.set_debug_visitor(std::move(visitor));
 }
 
 void HpackDecoder2::set_max_decode_buffer_size_bytes(
     size_t max_decode_buffer_size_bytes) {
   DVLOG(2) << "HpackDecoder2::set_max_decode_buffer_size_bytes";
   max_decode_buffer_size_bytes_ = max_decode_buffer_size_bytes;
 }
 
+size_t HpackDecoder2::EstimateMemoryUsage() const {
+  return base::trace_event::EstimateMemoryUsage(header_table_) +
+         base::trace_event::EstimateMemoryUsage(decoded_block_) +
+         base::trace_event::EstimateMemoryUsage(name_) +
+         base::trace_event::EstimateMemoryUsage(value_);
+}
+
 void HpackDecoder2::OnIndexedHeader(size_t index) {
   DVLOG(2) << "HpackDecoder2::OnIndexedHeader: index=" << index;
   DCHECK(!error_detected_);
   const HpackEntry* entry = header_table_.GetByIndex(index);
   if (entry == nullptr) {
     SetErrorDetected();
     return;
   }
   HandleHeaderRepresentation(entry->name(), entry->value());
 }
@@ skipping 149 matching lines @@
     decoded_block_.AppendValueOrAddHeader(name, value);
   } else {
     DVLOG(3) << "HpackDecoder2::HandleHeaderRepresentation "
              << "passing to handler";
     DCHECK(decoded_block_.empty());
     handler_->OnHeader(name, value);
   }
 }
 
 }  // namespace net