Track SimpleCache memory usage in net/ MemoryDumpProvider

net/disk_cache/simple/simple_index.cc

 // Copyright (c) 2013 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/disk_cache/simple/simple_index.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/field_trial.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/pickle.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_tokenizer.h"
 #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"
 #include "net/disk_cache/simple/simple_index_delegate.h"
 #include "net/disk_cache/simple/simple_index_file.h"
 #include "net/disk_cache/simple/simple_synchronous_entry.h"
 #include "net/disk_cache/simple/simple_util.h"
 
 #if defined(OS_POSIX)
 #include <sys/stat.h>
@@ skipping 225 matching lines @@
   uint64_t size = 0;
   for (const auto& entry : entries_set_) {
     const EntryMetadata& metadata = entry.second;
     base::Time entry_time = metadata.GetLastUsedTime();
     if (initial_time <= entry_time && entry_time < end_time)
       size += metadata.GetEntrySize();
   }
   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.
   // It will be updated later when the SimpleEntryImpl finishes opening or
   // creating the new entry, and then UpdateEntrySize will be called.
   InsertInEntrySet(entry_hash, EntryMetadata(base::Time::Now(), 0u),
                    &entries_set_);
   if (!initialized_)
     removed_entries_.erase(entry_hash);
   PostponeWritingToDisk();
@@ skipping 237 matching lines @@
                        start - last_write_to_disk_);
     }
   }
   last_write_to_disk_ = start;
 
   index_file_->WriteToDisk(reason, entries_set_, cache_size_, start,
                            app_on_background_, base::Closure());
 }
 
 }  // namespace disk_cache