[Experimental] Supporting OOPIF printing

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>
@@ skipping 49 matching lines @@
   bool SafePlayback(skia::NativeDrawingContext hdc) const override;
 #elif defined(OS_MACOSX)
   bool RenderPage(unsigned int page_number,
                   skia::NativeDrawingContext context,
                   const CGRect rect,
                   const MacRenderPageParams& params) const override;
 #endif
 
   bool SaveTo(base::File* file) const override;
 
+  bool InitFromPageDataBuffer(const char* src_buffer, size_t src_buffer_size);
+
   // Return a new metafile containing just the current page in draft mode.
   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);
 
+  std::unique_ptr<char[]> GetPageDataBuffer(size_t* size) const;
+
+  void ConvertPagesToPdf();
+  void FinishAllPages();
+  void GetSkp(SkWStream* stream) const;
+
  private:
   std::unique_ptr<PdfMetafileSkiaData> data_;
 
   DISALLOW_COPY_AND_ASSIGN(PdfMetafileSkia);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PDF_METAFILE_SKIA_H_