Add hooks to PDFium PostScript code

pdf/pdf_engine.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 PDF_PDF_ENGINE_H_
 #define PDF_PDF_ENGINE_H_
 
 #include <stdint.h>
 
 #include "build/build_config.h"
@@ skipping 323 matching lines @@
   virtual bool RenderPDFPageToDC(const void* pdf_buffer,
                                  int buffer_size,
                                  int page_number,
                                  const RenderingSettings& settings,
                                  HDC dc) = 0;
 
   virtual void SetPDFEnsureTypefaceCharactersAccessible(
       PDFEnsureTypefaceCharactersAccessible func) = 0;
 
   virtual void SetPDFUseGDIPrinting(bool enable) = 0;
+
+  virtual void SetPDFPostscriptPrintingLevel(int postscript_level) = 0;
 #endif  // defined(OS_WIN)
 
   // See the definition of RenderPDFPageToBitmap in pdf.cc for details.
   virtual bool RenderPDFPageToBitmap(const void* pdf_buffer,
                                      int pdf_buffer_size,
                                      int page_number,
                                      const RenderingSettings& settings,
                                      void* bitmap_buffer) = 0;
 
   virtual bool GetPDFDocInfo(const void* pdf_buffer,
                              int buffer_size,
                              int* page_count,
                              double* max_page_width) = 0;
 
   // See the definition of GetPDFPageSizeByIndex in pdf.cc for details.
   virtual bool GetPDFPageSizeByIndex(const void* pdf_buffer,
                                      int pdf_buffer_size,
                                      int page_number,
                                      double* width,
                                      double* height) = 0;
 };
 
 }  // namespace chrome_pdf
 
 #endif  // PDF_PDF_ENGINE_H_