Track SimpleCache memory usage in net/ MemoryDumpProvider

net/http/http_cache.h

 // 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.
 
 // This file declares a HttpTransactionFactory implementation that can be
 // layered on top of another HttpTransactionFactory to add HTTP caching.  The
 // caching logic follows RFC 7234 (any exceptions are called out in the code).
 //
 // The HttpCache takes a disk_cache::Backend as a parameter, and uses that for
 // the cache storage.
@@ skipping 20 matching lines @@
 #include "net/base/load_states.h"
 #include "net/base/net_export.h"
 #include "net/base/request_priority.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_transaction_factory.h"
 
 class GURL;
 
 namespace base {
 class SingleThreadTaskRunner;
+namespace trace_event {
+class ProcessMemoryDump;
+}
 }  // namespace base
 
 namespace disk_cache {
 class Backend;
 class Entry;
 }  // namespace disk_cache
 
 namespace net {
 
 class HttpNetworkSession;
@@ skipping 157 matching lines @@
   base::WeakPtr<HttpCache> GetWeakPtr() { return weak_factory_.GetWeakPtr(); }
 
   // Resets the network layer to allow for tests that probe
   // network changes (e.g. host unreachable).  The old network layer is
   // returned to allow for filter patterns that only intercept
   // some creation requests.  Note ownership exchange.
   std::unique_ptr<HttpTransactionFactory>
   SetHttpNetworkTransactionFactoryForTesting(
       std::unique_ptr<HttpTransactionFactory> new_network_layer);
 
+  // Dumps memory allocation stats. |parent_dump_absolute_name| is the name
+  // used by the parent MemoryAllocatorDump in the memory dump hierarchy.
+  void DumpMemoryStats(base::trace_event::ProcessMemoryDump* pmd,
+                       const std::string& parent_absolute_name) const;
+
  private:
   // Types --------------------------------------------------------------------
 
   // Disk cache entry data indices.
   enum {
     kResponseInfoIndex = 0,
     kResponseContentIndex,
     kMetadataIndex,
 
     // Must remain at the end of the enum.
     kNumCacheEntryDataIndices
   };
 
   class MetadataWriter;
   class QuicServerInfoFactoryAdaptor;
   class Transaction;
   class WorkItem;
   friend class Transaction;
   friend class ViewCacheHelper;
   struct PendingOp;  // Info for an entry under construction.
 
   typedef std::list<Transaction*> TransactionList;
   typedef std::list<std::unique_ptr<WorkItem>> WorkItemList;
 
   struct ActiveEntry {
     explicit ActiveEntry(disk_cache::Entry* entry);
     ~ActiveEntry();
+    size_t EstimateMemoryUsage() const;
 
     disk_cache::Entry* disk_entry;
     Transaction*       writer;
     TransactionList    readers;
     TransactionList    pending_queue;
     bool               will_process_pending_queue;
     bool               doomed;
   };
 
   using ActiveEntriesMap =
@@ skipping 167 matching lines @@
   std::unique_ptr<base::Clock> clock_;
 
   base::WeakPtrFactory<HttpCache> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpCache);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_CACHE_H_