[EasyUnlock] Move DataWithTimestamp out of ForegroundEidGenerator so it can be shared.

components/cryptauth/data_with_timestamp.h

+// Copyright 2017 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_CRYPTAUTH_BLE_DATA_WITH_TIMESTAMP_H_
+#define COMPONENTS_CRYPTAUTH_BLE_DATA_WITH_TIMESTAMP_H_
+
+#include <string>
+#include <vector>
+
+namespace cryptauth {
+
+// Stores EID-related data and timestamps at which time this data becomes
+// active or inactive.
+struct DataWithTimestamp {
+  DataWithTimestamp(const std::string& data,
+                    const int64_t start_timestamp_ms,
+                    const int64_t end_timestamp_ms);
+  DataWithTimestamp(const DataWithTimestamp& other);
+
+  // Helper function to convert a vector of DataWithTimestamp objects to a human
+  // readable debug string.
+  static std::string ToDebugString(
+      const std::vector<DataWithTimestamp>& data_with_timestamps);
+
+  bool ContainsTime(const int64_t timestamp_ms) const;
+  std::string DataInHex() const;
+
+  bool operator==(const DataWithTimestamp& other) const;
+
+  // The data valid for a given time period.
+  const std::string data;
+
+  // The start time for which the data is valid, inclusive.
+  const int64_t start_timestamp_ms;
+
+  // The end time for which the data is valid, exclusive.
+  const int64_t end_timestamp_ms;
+};
+
+}  // namespace
+
+#endif  // COMPONENTS_CRYPTAUTH_BLE_DATA_WITH_TIMESTAMP_H_