Improve memory estimate of SpdySessionPool in net/ MemoryDumpProvider.

net/spdy/hpack/hpack_huffman_table.cc

Index: net/spdy/hpack/hpack_huffman_table.cc
diff --git a/net/spdy/hpack/hpack_huffman_table.cc b/net/spdy/hpack/hpack_huffman_table.cc
index 0e3ca1b060eb5f49178ab881724dc6da60bf5b57..e4431f5affa1772f9344bc7a97f569f914cb9d15 100644
--- a/net/spdy/hpack/hpack_huffman_table.cc
+++ b/net/spdy/hpack/hpack_huffman_table.cc
@@ -10,6 +10,7 @@
 
 #include "base/logging.h"
 #include "base/numerics/safe_conversions.h"
+#include "base/trace_event/memory_usage_estimator.h"
 #include "net/spdy/hpack/hpack_input_stream.h"
 #include "net/spdy/hpack/hpack_output_stream.h"
 
@@ -318,4 +319,11 @@ bool HpackHuffmanTable::GenericDecodeString(HpackInputStream* in,
   return false;
 }
 
+size_t HpackHuffmanTable::EstimateMemoryUsage() const {
+  return base::trace_event::EstimateMemoryUsage(decode_tables_) +
+         base::trace_event::EstimateMemoryUsage(decode_entries_) +
+         base::trace_event::EstimateMemoryUsage(code_by_id_) +
+         base::trace_event::EstimateMemoryUsage(length_by_id_);
+}
+
 }  // namespace net