Track SimpleCache memory usage in net/ MemoryDumpProvider

net/http/http_cache.cc

Index: net/http/http_cache.cc
diff --git a/net/http/http_cache.cc b/net/http/http_cache.cc
index b02ddf02adf0a12669426d13131ce0e33839fe58..d1eaba19f488d49ca78e4b601aac84e05b84b02a 100644
--- a/net/http/http_cache.cc
+++ b/net/http/http_cache.cc
@@ -481,6 +481,12 @@ HttpCache::SetHttpNetworkTransactionFactoryForTesting(
   return old_network_layer;
 }
 
+void HttpCache::DumpMemoryStats(base::trace_event::ProcessMemoryDump* pmd,
+                                const std::string& parent_absolute_name) const {
+  if (disk_cache_)
+    disk_cache_->DumpMemoryStats(pmd, parent_absolute_name);

[ssid, 2017/01/31 22:24:19]

Are the other members here insignificant? like active_entries_, doomed_entries_,
playback_cache_map_ and network_layer_.

[xunjieli, 2017/02/01 01:15:52]

I don't know. I haven't seen those in traces that I obtained. Let's tackle those
in a follow-up. I added TODO.

+}
+
 //-----------------------------------------------------------------------------
 
 int HttpCache::CreateBackend(disk_cache::Backend** backend,