Add bitmaps and skp output to Skia port

public/fpdfview.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 // NOTE: External docs refer to this file as "fpdfview.h", so do not rename
 // despite lack of consistency with other public files.
 
 #ifndef PUBLIC_FPDFVIEW_H_
@@ skipping 564 matching lines @@
 //          None.
 DLLEXPORT void STDCALL FPDF_RenderPageBitmap(FPDF_BITMAP bitmap,
                                              FPDF_PAGE page,
                                              int start_x,
                                              int start_y,
                                              int size_x,
                                              int size_y,
                                              int rotate,
                                              int flags);
 
+FPDF_BITMAP FPDF_RenderPageSkp(FPDF_PAGE page,
+                               int size_x,
+                               int size_y);
+
 // Function: FPDF_ClosePage
 //          Close a loaded PDF page.
 // Parameters:
 //          page        -   Handle to the loaded page.
 // Return value:
 //          None.
 DLLEXPORT void STDCALL FPDF_ClosePage(FPDF_PAGE page);
 
 // Function: FPDF_CloseDocument
 //          Close a loaded PDF document.
@@ skipping 343 matching lines @@
 // Function: FPDF_BStr_Clear
 //          Helper function to clear a byte string.
 DLLEXPORT FPDF_RESULT STDCALL FPDF_BStr_Clear(FPDF_BSTR* str);
 #endif  // PDF_ENABLE_XFA
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif  // PUBLIC_FPDFVIEW_H_