Track SimpleCache memory usage in net/ MemoryDumpProvider

net/disk_cache/simple/simple_index.cc

Index: net/disk_cache/simple/simple_index.cc
diff --git a/net/disk_cache/simple/simple_index.cc b/net/disk_cache/simple/simple_index.cc
index a654faf37182e5287f715c87cce96efc9bc37045..57f9603a391e44c99c99192b7e28a54f5878ba8c 100644
--- a/net/disk_cache/simple/simple_index.cc
+++ b/net/disk_cache/simple/simple_index.cc
@@ -23,6 +23,7 @@
 #include "base/task_runner.h"
 #include "base/threading/worker_pool.h"
 #include "base/time/time.h"
+#include "base/trace_event/memory_usage_estimator.h"
 #include "net/base/net_errors.h"
 #include "net/disk_cache/simple/simple_entry_format.h"
 #include "net/disk_cache/simple/simple_histogram_macros.h"
@@ -268,6 +269,11 @@ uint64_t SimpleIndex::GetCacheSizeBetween(base::Time initial_time,
   return size;
 }
 
+size_t SimpleIndex::EstimateMemoryUsage() const {
+  return base::trace_event::EstimateMemoryUsage(entries_set_) +
+         base::trace_event::EstimateMemoryUsage(removed_entries_);
+}
+
 void SimpleIndex::Insert(uint64_t entry_hash) {
   DCHECK(io_thread_checker_.CalledOnValidThread());
   // Upon insert we don't know yet the size of the entry.