diff --git a/cros/excluder_chromeos.h b/cros/excluder_chromeos.h
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+//
+// Copyright (C) 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef UPDATE_ENGINE_CROS_EXCLUDER_CHROMEOS_H_
+#define UPDATE_ENGINE_CROS_EXCLUDER_CHROMEOS_H_
+
+#include <string>
+
+#include "update_engine/common/excluder_interface.h"
+#include "update_engine/common/prefs_interface.h"
+
+namespace chromeos_update_engine {
+
+class SystemState;
+
+// The Chrome OS implementation of the |ExcluderInterface|.
+class ExcluderChromeOS : public ExcluderInterface {
+ public:
+  explicit ExcluderChromeOS(PrefsInterface* prefs);
+  ~ExcluderChromeOS() = default;
+
+  // |ExcluderInterface| overrides.
+  bool Exclude(const std::string& name) override;
+  bool IsExcluded(const std::string& name) override;
+  bool Reset() override;
+
+  // Not copyable or movable.
+  ExcluderChromeOS(const ExcluderChromeOS&) = delete;
+  ExcluderChromeOS& operator=(const ExcluderChromeOS&) = delete;
+  ExcluderChromeOS(ExcluderChromeOS&&) = delete;
+  ExcluderChromeOS& operator=(ExcluderChromeOS&&) = delete;
+
+ private:
+  PrefsInterface* prefs_;
+};
+
+}  // namespace chromeos_update_engine
+
+#endif  // UPDATE_ENGINE_CROS_EXCLUDER_CHROMEOS_H_