Files required by a service now listed in manifest.

services/catalog/public/cpp/manifest_parsing_util.h

+// 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 SERVICES_CATALOG_PUBLIC_CPP_MANIFEST_PARSING_UTIL_H_
+#define SERVICES_CATALOG_PUBLIC_CPP_MANIFEST_PARSING_UTIL_H_
+
+#include <map>
+#include <string>
+
+#include "base/files/file_path.h"
+#include "base/optional.h"
+
+namespace base {
+class Value;
+}
+
+// TODO(jcivelli): http://crbug.com/687250 Remove this file and inline
+//                 PopulateRequiredFiles() in Entry::Deserialize.
+namespace catalog {
+
+using RequiredFileMap = std::map<std::string, base::FilePath>;
+
+base::Optional<RequiredFileMap> RetrieveRequiredFiles(
+    const base::Value& manifest);
+
+}  // namespace content
+
+#endif  // SERVICES_CATALOG_PUBLIC_CPP_MANIFEST_PARSING_UTIL_H_