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diff --git a/chromium/components/federated_learning/floc_id.h b/chromium/components/federated_learning/floc_id.h
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+++ b/chromium/components/federated_learning/floc_id.h
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+// Copyright 2020 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_FEDERATED_LEARNING_FLOC_ID_H_
+#define COMPONENTS_FEDERATED_LEARNING_FLOC_ID_H_
+
+#include "base/optional.h"
+
+#include <stdint.h>
+
+#include <string>
+#include <unordered_set>
+
+namespace federated_learning {
+
+// ID used to represent a cohort of people with similar browsing habits. For
+// more context, see the explainer at
+// https://github.com/jkarlin/floc/blob/master/README.md
+class FlocId {
+ public:
+  static FlocId CreateFromHistory(
+      const std::unordered_set<std::string>& domains);
+
+  FlocId();
+  explicit FlocId(uint64_t id);
+  FlocId(const FlocId& id);
+
+  ~FlocId();
+  FlocId& operator=(const FlocId& id);
+  FlocId& operator=(FlocId&& id);
+
+  bool IsValid() const;
+  uint64_t ToUint64() const;
+
+  std::string ToDebugHeaderValue() const;
+
+ private:
+  std::string ToHeaderValue() const;
+
+  base::Optional<uint64_t> id_;
+};
+
+}  // namespace federated_learning
+
+#endif  // COMPONENTS_FEDERATED_LEARNING_FLOC_ID_H_