Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/spdy_framer_decoder_adapter.cc

 // Copyright (c) 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/spdy_framer_decoder_adapter.h"
 
 #include <memory>
 #include <string>
 #include <utility>
 
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
+#include "net/spdy/platform/api/spdy_estimate_memory_usage.h"
 
 #if defined(COMPILER_GCC)
 #define PRETTY_THIS base::StringPrintf("%s@%p ", __PRETTY_FUNCTION__, this)
 #elif defined(COMPILER_MSVC)
 #define PRETTY_THIS base::StringPrintf("%s@%p ", __FUNCSIG__, this)
 #else
 #define PRETTY_THIS base::StringPrintf("%s@%p ", __func__, this)
 #endif
 
 namespace net {
@@ skipping 200 matching lines @@
 
   void Reset() override { framer_.Reset(); }
 
   SpdyFramer::SpdyFramerError spdy_framer_error() const override {
     return framer_.spdy_framer_error();
   }
   SpdyFramer::SpdyState state() const override { return framer_.state(); }
   bool probable_http_response() const override {
     return framer_.probable_http_response();
   }
+  size_t EstimateMemoryUsage() const override {
+    // Skip |visitor_adapter_| because it doesn't allocate.
+    return SpdyEstimateMemoryUsage(framer_);
+  }
 
  private:
   SpdyFramer framer_;
   SpdyFramer* const outer_;
   std::unique_ptr<SpdyFramerVisitorAdapter> visitor_adapter_;
 };
 
 std::unique_ptr<SpdyFramerDecoderAdapter> CreateNestedSpdyFramerDecoder(
     SpdyFramer* outer) {
   return std::unique_ptr<SpdyFramerDecoderAdapter>(
       new NestedSpdyFramerDecoder(outer));
 }
 
 }  // namespace net