Track SimpleCache memory usage in net/ MemoryDumpProvider

net/disk_cache/simple/simple_entry_impl.h

 // 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.
 
 #ifndef NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_IMPL_H_
 #define NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 104 matching lines @@
                       int buf_len,
                       const CompletionCallback& callback) override;
   int GetAvailableRange(int64_t offset,
                         int len,
                         int64_t* start,
                         const CompletionCallback& callback) override;
   bool CouldBeSparse() const override;
   void CancelSparseIO() override;
   int ReadyForSparseIO(const CompletionCallback& callback) override;
 
+  // Returns the estimate of dynamically allocated memory in bytes.
+  size_t EstimateMemoryUsage() const;
+
  private:
   class ScopedOperationRunner;
   friend class ScopedOperationRunner;
 
   enum State {
     // The state immediately after construction, but before |synchronous_entry_|
     // has been assigned. This is the state at construction, and is the only
     // legal state to destruct an entry in.
     STATE_UNINITIALIZED,
 
@@ skipping 247 matching lines @@
   // 1 on disk, to reduce the number of file descriptors and save disk space.
   // This strategy allows stream 1 to change size easily. Since stream 0 is only
   // used to write HTTP headers, the memory consumption of keeping it in memory
   // is acceptable.
   scoped_refptr<net::GrowableIOBuffer> stream_0_data_;
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_SIMPLE_SIMPLE_ENTRY_IMPL_H_