Files required by a service now listed in manifest.

services/service_manager/public/cpp/required_file_descriptor.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_SERVICE_MANAGER_PUBLIC_CPP_REQUIRED_FILE_DESCRIPTOR_H_
+#define SERVICES_SERVICE_MANAGER_PUBLIC_CPP_REQUIRED_FILE_DESCRIPTOR_H_
+
+#include "base/files/file_path.h"
+#include "base/files/memory_mapped_file.h"
+
+namespace service_manager {
+
+struct RequiredFileDescriptor {
+  base::FilePath path;
+
+  // Region of interest in the file.
+  base::MemoryMappedFile::Region region =
+      base::MemoryMappedFile::Region::kWholeFile;
+
+  bool IsRegionWholeFile() const {
+    return region == base::MemoryMappedFile::Region::kWholeFile;
+  }
+};
+
+using RequiredFileDescriptorMap = std::map<std::string, RequiredFileDescriptor>;
+
+}  // namespace service_manager
+
+#endif  // SERVICES_SERVICE_MANAGER_PUBLIC_CPP_REQUIRED_FILE_DESCRIPTOR_H_