PdfMetafileSkia: start supporting more document types.

components/printing/test/mock_printer.cc

Index: components/printing/test/mock_printer.cc
diff --git a/components/printing/test/mock_printer.cc b/components/printing/test/mock_printer.cc
index 99bdcb365d9df45e8ab18c2cf61910bffc3b63a1..4197dc603b584709e98e3d2d92c279e943983473 100644
--- a/components/printing/test/mock_printer.cc
+++ b/components/printing/test/mock_printer.cc
@@ -204,7 +204,7 @@ void MockPrinter::PrintPage(const PrintHostMsg_DidPrintPage_Params& params) {
 #if defined(OS_MACOSX)
   printing::PdfMetafileCg metafile;
 #else
-  printing::PdfMetafileSkia metafile;
+  printing::PdfMetafileSkia metafile(printing::PDF_SKIA_DOCUMENT_TYPE);
 #endif
   metafile.InitFromData(metafile_data.memory(), params.data_size);
   printing::Image image(metafile);