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diff --git a/chromium/services/preferences/tracked/tracked_atomic_preference.h b/chromium/services/preferences/tracked/tracked_atomic_preference.h
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+++ b/chromium/services/preferences/tracked/tracked_atomic_preference.h
@@ -0,0 +1,55 @@
+// Copyright 2014 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 SERVICES_PREFERENCES_TRACKED_TRACKED_ATOMIC_PREFERENCE_H_
+#define SERVICES_PREFERENCES_TRACKED_TRACKED_ATOMIC_PREFERENCE_H_
+
+#include <stddef.h>
+
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "services/preferences/tracked/pref_hash_filter.h"
+#include "services/preferences/tracked/tracked_preference.h"
+#include "services/preferences/tracked/tracked_preference_helper.h"
+
+namespace prefs {
+namespace mojom {
+class TrackedPreferenceValidationDelegate;
+}
+}
+
+// A TrackedAtomicPreference is tracked as a whole. A hash is stored for its
+// entire value and it is entirely reset on mismatch. An optional delegate is
+// notified of the status of the preference during enforcement.
+class TrackedAtomicPreference : public TrackedPreference {
+ public:
+  TrackedAtomicPreference(
+      const std::string& pref_path,
+      size_t reporting_id,
+      size_t reporting_ids_count,
+      prefs::mojom::TrackedPreferenceMetadata::EnforcementLevel
+          enforcement_level,
+      prefs::mojom::TrackedPreferenceMetadata::ValueType value_type,
+      prefs::mojom::TrackedPreferenceValidationDelegate* delegate);
+
+  // TrackedPreference implementation.
+  TrackedPreferenceType GetType() const override;
+  void OnNewValue(const base::Value* value,
+                  PrefHashStoreTransaction* transaction) const override;
+  bool EnforceAndReport(
+      base::DictionaryValue* pref_store_contents,
+      PrefHashStoreTransaction* transaction,
+      PrefHashStoreTransaction* external_validation_transaction) const override;
+
+ private:
+  const std::string pref_path_;
+  const TrackedPreferenceHelper helper_;
+  prefs::mojom::TrackedPreferenceValidationDelegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(TrackedAtomicPreference);
+};
+
+#endif  // SERVICES_PREFERENCES_TRACKED_TRACKED_ATOMIC_PREFERENCE_H_