Import Cobalt 21.master.0.260628
diff --git a/src/components/update_client/update_checker.h b/src/components/update_client/update_checker.h
new file mode 100644
index 0000000..30e4fba
--- /dev/null
+++ b/src/components/update_client/update_checker.h
@@ -0,0 +1,71 @@
+// 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 COMPONENTS_UPDATE_CLIENT_UPDATE_CHECKER_H_
+#define COMPONENTS_UPDATE_CLIENT_UPDATE_CHECKER_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/containers/flat_map.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/optional.h"
+#include "components/update_client/component.h"
+#include "components/update_client/protocol_parser.h"
+#include "url/gurl.h"
+
+namespace update_client {
+
+class Configurator;
+class PersistedData;
+
+class UpdateChecker {
+ public:
+ using UpdateCheckCallback = base::OnceCallback<void(
+ const base::Optional<ProtocolParser::Results>& results,
+ ErrorCategory error_category,
+ int error,
+ int retry_after_sec)>;
+
+ using Factory =
+ std::unique_ptr<UpdateChecker> (*)(scoped_refptr<Configurator> config,
+ PersistedData* persistent);
+
+ virtual ~UpdateChecker() = default;
+
+ // Initiates an update check for the components specified by their ids.
+ // |additional_attributes| provides a way to customize the <request> element.
+ // |is_foreground| controls the value of "X-Goog-Update-Interactivity"
+ // header which is sent with the update check.
+ // On completion, the state of |components| is mutated as required by the
+ // server response received.
+ virtual void CheckForUpdates(
+ const std::string& session_id,
+ const std::vector<std::string>& ids_to_check,
+ const IdToComponentPtrMap& components,
+ const base::flat_map<std::string, std::string>& additional_attributes,
+ bool enabled_component_updates,
+ UpdateCheckCallback update_check_callback) = 0;
+
+ static std::unique_ptr<UpdateChecker> Create(
+ scoped_refptr<Configurator> config,
+ PersistedData* persistent);
+
+#if defined(OS_STARBOARD)
+ virtual PersistedData* GetPersistedData() = 0;
+#endif
+
+ protected:
+ UpdateChecker() = default;
+
+ private:
+ DISALLOW_COPY_AND_ASSIGN(UpdateChecker);
+};
+
+} // namespace update_client
+
+#endif // COMPONENTS_UPDATE_CLIENT_UPDATE_CHECKER_H_
