PdfMetafileSkia: start supporting more document types.

printing/pdf_metafile_skia.h

 // Copyright (c) 2012 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_PDF_METAFILE_SKIA_H_
 #define PRINTING_PDF_METAFILE_SKIA_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "printing/metafile.h"
 #include "skia/ext/platform_canvas.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 class SkCanvas;
 
-#if defined(OS_CHROMEOS) || defined(OS_ANDROID)
-namespace base {
-struct FileDescriptor;
-}
-#endif
+namespace printing {
 
-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.
 class PRINTING_EXPORT PdfMetafileSkia : public Metafile {
  public:
-  PdfMetafileSkia();
+  explicit PdfMetafileSkia(SkiaDocumentType type);
   ~PdfMetafileSkia() override;
 
   // Metafile methods.
   bool Init() override;
   bool InitFromData(const void* src_buffer, uint32_t src_buffer_size) override;
 
   void StartPage(const gfx::Size& page_size,
                  const gfx::Rect& content_area,
                  const float& scale_factor) override;
   bool FinishPage() override;
@@ skipping 14 matching lines @@
 #elif defined(OS_MACOSX)
   bool RenderPage(unsigned int page_number,
                   gfx::NativeDrawingContext context,
                   const CGRect rect,
                   const MacRenderPageParams& params) const override;
 #endif
 
   bool SaveTo(base::File* file) const override;
 
   // Return a new metafile containing just the current page in draft mode.
-  std::unique_ptr<PdfMetafileSkia> GetMetafileForCurrentPage();
+  std::unique_ptr<PdfMetafileSkia> GetMetafileForCurrentPage(
+      SkiaDocumentType type);
 
   // This method calls StartPage and then returns an appropriate
   // PlatformCanvas implementation bound to the context created by
   // StartPage or NULL on error.  The SkCanvas pointer that
   // is returned is owned by this PdfMetafileSkia object and does not
   // need to be ref()ed or unref()ed.  The canvas will remain valid
   // until FinishPage() or FinishDocument() is called.
   SkCanvas* GetVectorCanvasForNewPage(const gfx::Size& page_size,
                                       const gfx::Rect& content_area,
                                       const float& scale_factor);
 
  private:
   std::unique_ptr<PdfMetafileSkiaData> data_;
 
   DISALLOW_COPY_AND_ASSIGN(PdfMetafileSkia);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PDF_METAFILE_SKIA_H_