Add PDF compositor service

components/printing/service/pdf_compositor_service.h

Index: components/printing/service/pdf_compositor_service.h
diff --git a/components/printing/service/pdf_compositor_service.h b/components/printing/service/pdf_compositor_service.h
new file mode 100644
index 0000000000000000000000000000000000000000..20525f487507aa47d56a8a34989275abcb4db7bf
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+++ b/components/printing/service/pdf_compositor_service.h
@@ -0,0 +1,49 @@
+// 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_PDF_COMPOSITOR_SERVICE_H_
+#define COMPONENTS_PRINTING_SERVICE_PDF_COMPOSITOR_SERVICE_H_
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "components/discardable_memory/client/client_discardable_shared_memory_manager.h"
+#include "components/printing/service/public/interfaces/pdf_compositor.mojom.h"
+#include "services/service_manager/public/cpp/bind_source_info.h"
+#include "services/service_manager/public/cpp/binder_registry.h"
+#include "services/service_manager/public/cpp/service.h"
+#include "services/service_manager/public/cpp/service_context_ref.h"
+
+namespace printing {
+
+class PdfCompositorService : public service_manager::Service {
+ public:
+  PdfCompositorService();
+  ~PdfCompositorService() override;
+
+  // Factory function for use as an embedded service.
+  static std::unique_ptr<service_manager::Service> Create(
+      const std::string& creator);
+
+  // service_manager::Service:
+  void OnStart() override;
+  void OnBindInterface(const service_manager::BindSourceInfo& source_info,
+                       const std::string& interface_name,
+                       mojo::ScopedMessagePipeHandle interface_pipe) override;
+
+ private:
+  std::unique_ptr<discardable_memory::ClientDiscardableSharedMemoryManager>
+      discardable_shared_memory_manager_;
+  std::unique_ptr<service_manager::ServiceContextRefFactory> ref_factory_;
+  service_manager::BinderRegistry registry_;
+  base::WeakPtrFactory<PdfCompositorService> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PdfCompositorService);
+};
+
+}  // namespace printing
+
+#endif  // COMPONENTS_PRINTING_SERVICE_PDF_COMPOSITOR_SERVICE_H_