Add PDF compositor service

printing/common/pdf_metafile_utils.h

Index: printing/common/pdf_metafile_utils.h
diff --git a/printing/common/pdf_metafile_utils.h b/printing/common/pdf_metafile_utils.h
new file mode 100644
index 0000000000000000000000000000000000000000..78d2b530f31cbd42506502261459c49ffcd499df
--- /dev/null
+++ b/printing/common/pdf_metafile_utils.h
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+// 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 PRINTING_COMMON_PDF_METAFILE_UTILS_H_
+#define PRINTING_COMMON_PDF_METAFILE_UTILS_H_
+
+#include <string>
+
+#include "skia/ext/platform_canvas.h"
+#include "third_party/skia/include/core/SkDocument.h"
+#include "third_party/skia/include/core/SkRefCnt.h"
+#include "third_party/skia/include/core/SkStream.h"
+
+namespace printing {
+
+enum SkiaDocumentType {
+  PDF_SKIA_DOCUMENT_TYPE,
+  // MSKP is an experimental, fragile, and diagnostic-only document type.
+  MSKP_SKIA_DOCUMENT_TYPE,
+};
+
+sk_sp<SkDocument> MakePdfDocument(const std::string& creator,
+                                  SkWStream* stream);
+
+}  // namespace printing
+
+#endif  // PRINTING_COMMON_PDF_METAFILE_UTILS_H_