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diff --git a/chromium/components/feature_engagement_tracker/internal/never_availability_model.h b/chromium/components/feature_engagement_tracker/internal/never_availability_model.h
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+++ b/chromium/components/feature_engagement_tracker/internal/never_availability_model.h
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+// 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_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_NEVER_AVAILABILITY_MODEL_H_
+#define COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_NEVER_AVAILABILITY_MODEL_H_
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "components/feature_engagement_tracker/internal/availability_model.h"
+
+namespace feature_engagement_tracker {
+
+// An AvailabilityModel that never has any data, and is ready after having been
+// initialized.
+class NeverAvailabilityModel : public AvailabilityModel {
+ public:
+  NeverAvailabilityModel();
+  ~NeverAvailabilityModel() override;
+
+  // AvailabilityModel implementation.
+  void Initialize(AvailabilityModel::OnInitializedCallback callback,
+                  uint32_t current_day) override;
+  bool IsReady() const override;
+  base::Optional<uint32_t> GetAvailability(
+      const base::Feature& feature) const override;
+
+ private:
+  // Sets |ready_| to true and posts the result to |callback|. This method
+  // exists to ensure that |ready_| is not updated directly in the
+  // Initialize(...) method.
+  void ForwardedOnInitializedCallback(OnInitializedCallback callback);
+
+  // Whether the model has been successfully initialized.
+  bool ready_;
+
+  DISALLOW_COPY_AND_ASSIGN(NeverAvailabilityModel);
+};
+
+}  // namespace feature_engagement_tracker
+
+#endif  // COMPONENTS_FEATURE_ENGAGEMENT_TRACKER_INTERNAL_NEVER_AVAILABILITY_MODEL_H_