Add PDF compositor service

components/printing/service/pdf_compositor_impl.h

Index: components/printing/service/pdf_compositor_impl.h
diff --git a/components/printing/service/pdf_compositor_impl.h b/components/printing/service/pdf_compositor_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..b7890fa10ee2e73758dbcb2402a976b4e9aec778
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+++ b/components/printing/service/pdf_compositor_impl.h
@@ -0,0 +1,38 @@
+// 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_IMPL_H_
+#define COMPONENTS_PRINTING_SERVICE_PDF_COMPOSITOR_IMPL_H_
+
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "components/printing/service/public/interfaces/pdf_compositor.mojom.h"
+#include "mojo/public/cpp/system/buffer.h"
+#include "services/service_manager/public/cpp/service_context_ref.h"
+
+namespace printing {
+
+class PdfCompositorImpl : public mojom::PdfCompositor {
+ public:
+  PdfCompositorImpl(
+      const std::string& creator,
+      std::unique_ptr<service_manager::ServiceContextRef> service_ref);
+  ~PdfCompositorImpl() override;
+
+  void CompositePdf(
+      mojo::ScopedSharedBufferHandle sk_handle,
+      mojom::PdfCompositor::CompositePdfCallback callback) override;
+
+ private:
+  const std::unique_ptr<service_manager::ServiceContextRef> service_ref_;
+  const std::string creator_;
+
+  DISALLOW_COPY_AND_ASSIGN(PdfCompositorImpl);
+};
+
+}  // namespace printing
+
+#endif  // COMPONENTS_PRINTING_SERVICE_PDF_COMPOSITOR_IMPL_H_