Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/http2/hpack/decoder/http2_hpack_decoder.cc

 // Copyright 2017 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/http2/hpack/decoder/http2_hpack_decoder.h"
 
 #include "base/logging.h"
+#include "base/trace_event/memory_usage_estimator.h"
 #include "net/http2/decoder/decode_status.h"
 
 using base::StringPiece;
 
 namespace net {
 
 Http2HpackDecoder::Http2HpackDecoder(HpackDecoderListener* listener,
                                      size_t max_string_size)
     : decoder_state_(listener),
       entry_buffer_(&decoder_state_, max_string_size),
@@ skipping 91 matching lines @@
       DVLOG(2) << "Http2HpackDecoder::error_detected in entry_buffer_";
       error_detected_ = true;
     } else if (decoder_state_.error_detected()) {
       DVLOG(2) << "Http2HpackDecoder::error_detected in decoder_state_";
       error_detected_ = true;
     }
   }
   return error_detected_;
 }
 
+size_t Http2HpackDecoder::EstimateMemoryUsage() const {
+  return base::trace_event::EstimateMemoryUsage(entry_buffer_);
+}
+
 void Http2HpackDecoder::ReportError(StringPiece error_message) {
   DVLOG(3) << "Http2HpackDecoder::ReportError is new="
            << (!error_detected_ ? "true" : "false")
            << ", error_message: " << error_message;
   if (!error_detected_) {
     error_detected_ = true;
     listener()->OnHeaderErrorDetected(error_message);
   }
 }
 
 }  // namespace net