Add PDF compositor service

printing/pdf_metafile_skia.h

Index: printing/pdf_metafile_skia.h
diff --git a/printing/pdf_metafile_skia.h b/printing/pdf_metafile_skia.h
index 948e27f45e088f54ad91072040f4865e2f5b2796..dacd1a74cb0a2bd7251dcef1eb61510f0369785d 100644
--- a/printing/pdf_metafile_skia.h
+++ b/printing/pdf_metafile_skia.h
@@ -12,6 +12,7 @@
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "cc/paint/paint_canvas.h"
+#include "printing/common/pdf_metafile_utils.h"
 #include "printing/metafile.h"
 #include "skia/ext/platform_canvas.h"
 
@@ -21,12 +22,6 @@
 
 namespace printing {
 
-enum SkiaDocumentType {
-  PDF_SKIA_DOCUMENT_TYPE,
-  // MSKP is an experimental, fragile, and diagnostic-only document type.
-  MSKP_SKIA_DOCUMENT_TYPE,
-};
-
 struct PdfMetafileSkiaData;
 
 // This class uses Skia graphics library to generate a PDF document.