Instrument SpdySessionPool using MemoryDumpProvider

net/http/http_network_session.cc

Index: net/http/http_network_session.cc
diff --git a/net/http/http_network_session.cc b/net/http/http_network_session.cc
index 5d2a78681c4ed644a8b536be7f850a02ba7b0fef..0c3129112a56686f550870f3cf6b44dad75d976e 100644
--- a/net/http/http_network_session.cc
+++ b/net/http/http_network_session.cc
@@ -399,6 +399,8 @@ void HttpNetworkSession::DumpMemoryStats(
   http_network_session_dump = pmd->CreateAllocatorDump(name);
   normal_socket_pool_manager_->DumpMemoryStats(
       pmd, http_network_session_dump->absolute_name());
+  spdy_session_pool_.DumpMemoryStats(
+      pmd, http_network_session_dump->absolute_name());
   pmd->AddOwnershipEdge(pmd->GetAllocatorDump(parent_absolute_name)->guid(),
                         http_network_session_dump->guid());
 }