Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/spdy_buffer_producer.cc

 // Copyright (c) 2013 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/spdy_buffer_producer.h"
 
 #include <utility>
 
 #include "base/logging.h"
+#include "net/spdy/platform/api/spdy_estimate_memory_usage.h"
 #include "net/spdy/spdy_buffer.h"
 #include "net/spdy/spdy_protocol.h"
 
 namespace net {
 
 SpdyBufferProducer::SpdyBufferProducer() {}
 
 SpdyBufferProducer::~SpdyBufferProducer() {}
 
 SimpleBufferProducer::SimpleBufferProducer(std::unique_ptr<SpdyBuffer> buffer)
     : buffer_(std::move(buffer)) {}
 
 SimpleBufferProducer::~SimpleBufferProducer() {}
 
 std::unique_ptr<SpdyBuffer> SimpleBufferProducer::ProduceBuffer() {
   DCHECK(buffer_);
   return std::move(buffer_);
 }
 
+size_t SimpleBufferProducer::EstimateMemoryUsage() const {
+  return SpdyEstimateMemoryUsage(buffer_);
+}
+
 }  // namespace net