Add PDF compositor service

components/printing/service/public/cpp/pdf_compositor_client.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_CLIENT_H_
+#define COMPONENTS_PRINTING_SERVICE_PUBLIC_CPP_PDF_COMPOSITOR_CLIENT_H_
+
+#include "base/memory/shared_memory_handle.h"
+#include "components/printing/service/public/interfaces/pdf_compositor.mojom.h"
+#include "services/service_manager/public/cpp/connector.h"
+
+namespace printing {
+
+// Helper class to composite a pdf via the pdf_compositor service.
+class PdfCompositorClient {
+ public:
+  PdfCompositorClient();
+  ~PdfCompositorClient();
+
+  // Composite the final picture and convert into a PDF file.
+  void Composite(service_manager::Connector* connector,
+                 base::SharedMemoryHandle handle,
+                 uint32_t data_size,
+                 const mojom::PdfCompositor::CompositePdfCallback& callback,
+                 scoped_refptr<base::SequencedTaskRunner> callback_task_runner);
+
+ private:
+  // Connect to the service.
+  void Connect(service_manager::Connector* connector);
+
+  mojom::PdfCompositorPtr compositor_;
+
+  DISALLOW_COPY_AND_ASSIGN(PdfCompositorClient);
+};
+
+}  // namespace printing
+
+#endif  // COMPONENTS_PRINTING_SERVICE_PUBLIC_CPP_PDF_COMPOSITOR_CLIENT_H_