Track SimpleCache memory usage in net/ MemoryDumpProvider

net/disk_cache/blockfile/backend_impl.cc

 // Copyright (c) 2012 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/blockfile/backend_impl.h"
 
 #include <limits>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 1315 matching lines @@
   item.second = "Blockfile Cache";
   stats->push_back(item);
 
   stats_.GetItems(stats);
 }
 
 void BackendImpl::OnExternalCacheHit(const std::string& key) {
   background_queue_.OnExternalCacheHit(key);
 }
 
+size_t BackendImpl::EstimateMemoryUsage() const {
+  // TODO(xunjieli): Implement this. crbug.com/669108.
+  return 0;
+}
+
 // ------------------------------------------------------------------------
 
 // We just created a new file so we're going to write the header and set the
 // file length to include the hash table (zero filled).
 bool BackendImpl::CreateBackingStore(disk_cache::File* file) {
   AdjustMaxCacheSize(0);
 
   IndexHeader header;
   header.table_len = DesiredIndexTableLen(max_size_);
 
@@ skipping 763 matching lines @@
     if (total_memory > kMaxBuffersSize || total_memory <= 0)
       total_memory = kMaxBuffersSize;
 
     done = true;
   }
 
   return static_cast<int>(total_memory);
 }
 
 }  // namespace disk_cache