cashew: add local byte counters

src/byte_counter.cc

Index: src/byte_counter.cc
diff --git a/src/byte_counter.cc b/src/byte_counter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a688cb9d9f73c8626438a006a6871865c6d8315e
--- /dev/null
+++ b/src/byte_counter.cc
@@ -0,0 +1,19 @@
+// 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.
+
+#include "src/byte_counter.h"
+
+#include <glog/logging.h>
+
+#include "src/procfs_byte_counter.h"
+
+namespace cashew {
+
+// static
+ByteCounter* ByteCounter::NewByteCounter(const std::string& interface) {
+  DCHECK(!interface.empty());
+  return new(std::nothrow) ProcfsByteCounter(interface);
+}
+
+}  // namespace cashew