Create component to expose network usage stats to consumers.

components/data_usage/core/data_use.h

Index: components/data_usage/core/data_use.h
diff --git a/components/data_usage/core/data_use.h b/components/data_usage/core/data_use.h
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+// Copyright 2015 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 COMPONENTS_DATA_USAGE_CORE_DATA_USE_H_
+#define COMPONENTS_DATA_USAGE_CORE_DATA_USE_H_
+
+#include <stdint.h>
+
+#include "base/time/time.h"
+#include "net/base/network_change_notifier.h"
+#include "url/gurl.h"
+
+namespace data_usage {
+
+struct DataUse {
+  DataUse(const GURL& url,
+          const base::Time& request_time,
+          const GURL& first_party_for_cookies,
+          int32_t tab_id,
+          net::NetworkChangeNotifier::ConnectionType connection_type,
+          int64_t tx_bytes,
+          int64_t rx_bytes);
+
+  GURL url;
+  // The time when the request that is associated with these bytes was started.
+  base::Time request_time;
+  GURL first_party_for_cookies;
+  int32_t tab_id;
+  net::NetworkChangeNotifier::ConnectionType connection_type;
+  // TODO(sclittle): Add more network info here, e.g. for Android, SIM operator
+  // and whether the device is roaming.
+
+  int64_t tx_bytes;
+  int64_t rx_bytes;
+};
+
+}  // namespace data_usage
+
+#endif  // COMPONENTS_DATA_USAGE_CORE_DATA_USE_H_