cashew: reset local counter on plan transition

src/procfs_byte_counter.h

 // Copyright (c) 2010 The Chromium OS 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 SRC_PROCFS_BYTE_COUNTER_H_
 #define SRC_PROCFS_BYTE_COUNTER_H_
 
 #include <stdio.h>
 
 #include <glib.h>
 #include <sys/socket.h>
 #include <linux/netdevice.h>
 
 #include <string>
 
 #include <base/basictypes.h>  // NOLINT
 
 #include "src/byte_counter.h"
 
 namespace cashew {
 
 // a procfs-based implementation of the ByteCounter interface
 class ProcfsByteCounter: public ByteCounter {
   public:
     explicit ProcfsByteCounter(const std::string& interface);
     virtual ~ProcfsByteCounter();
     virtual const std::string& GetInterface() const;
     virtual uint64 GetRxBytes() const;
+    virtual void SetRxBytes(uint64 rx_bytes);
     virtual uint64 GetTxBytes() const;
+    virtual void SetTxBytes(uint64 tx_bytes);
     virtual void SetDelegate(ByteCounterDelegate *delegate);
 
   private:
     // interface name
     const std::string interface_;
 
     // file pointer for open /proc/net/dev virtual file
     // can be NULL
     FILE *proc_net_dev_fp_;
 
@@ skipping 41 matching lines @@
 
     // new stats are available, update counter
     void OnStatsUpdate(const struct net_device_stats& stats);
 
     DISALLOW_COPY_AND_ASSIGN(ProcfsByteCounter);
 };
 
 }  // namespace cashew
 
 #endif  // SRC_PROCFS_BYTE_COUNTER_H_