cashew: reset local counter on plan transition

src/device.h

 // Copyright (c) 2010, 2011 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_DEVICE_H_
 #define SRC_DEVICE_H_
 
 #include <string>
 
 #include <base/basictypes.h>  // NOLINT
@@ skipping 46 matching lines @@
     // returns true on success and false on failure
     virtual bool StartByteCounter() = 0;
 
     // destroy any existing byte counter
     // |parent_| will no longer receive updates after this call
     virtual void StopByteCounter() = 0;
 
     // is the byte counter running?
     virtual bool ByteCounterRunning() const = 0;
 
+    // reset byte counter to an arbitrary baseline value
+    // counter will continue to run and increment relative to new baseline
+    // there must be an existing byte counter
+    // |parent_| must already have received at least one update

[Eric Shienbrood, 2011/02/10 18:47:00]

parent_ is in the implementation class, so it's kind of weird to refer to it
here. Probably better to say "Parent service must already have received one
update"

[Vince Laviano, 2011/02/10 22:29:19]

Done.

+    virtual void ResetByteCounter(uint64 rx_bytes, uint64 tx_bytes) = 0;
+
     // factory
     static Device* NewDevice(Service * const parent,
                              DBus::Connection& connection,  // NOLINT
                              const DBus::Path& path);
 
   private:
     DISALLOW_COPY_AND_ASSIGN(Device);
 };
 
 }  // namespace cashew
 
 #endif  // SRC_DEVICE_H_