Add PDF compositor service

components/printing/service/public/cpp/pdf_compositor_service_factory.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 COMPONENTS_PRINTING_SERVICE_PUBLIC_CPP_PDF_COMPOSITOR_SERVICE_FACTORY_H_
+#define COMPONENTS_PRINTING_SERVICE_PUBLIC_CPP_PDF_COMPOSITOR_SERVICE_FACTORY_H_
+
+#include <memory>
+#include <string>
+
+#include "services/service_manager/public/cpp/service.h"
+
+namespace printing {
+
+std::unique_ptr<service_manager::Service> CreatePdfCompositorService(
+    const std::string& creator);
+
+}  // namespace printing
+
+#endif  // COMPONENTS_PRINTING_SERVICE_PUBLIC_CPP_PDF_COMPOSITOR_SERVICE_FACTORY_H_