PrintPreview: Implement GetMetafileForCurrentPage() function in PdfMetafileSkia.

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 c28cd08a5b5a4ab2f9d05e58897ef6917e608168..5d6d448d90f55f7f606d6bb53c6cf248e620a7f8 100644
--- a/printing/pdf_metafile_skia.h
+++ b/printing/pdf_metafile_skia.h
@@ -68,12 +68,18 @@ class PdfMetafileSkia : public Metafile {
   virtual bool SaveToFD(const base::FileDescriptor& fd) const;
 #endif  // if defined(OS_CHROMEOS)
 
+  // Return a new metafile containing just the current page in draft mode.
+  PdfMetafileSkia* GetMetafileForCurrentPage();
+
  private:
   scoped_ptr<PdfMetafileSkiaData> data_;
 
   // True when a draft version of metafile is requested.
   mutable bool draft_;
 
+  // True when finish page is outstanding for current page.
+  bool page_outstanding_;
+
   DISALLOW_COPY_AND_ASSIGN(PdfMetafileSkia);
 };