Add APIs for getting bookmarks and named destinations.

fpdfsdk/include/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
 
 
 #ifndef _FPDFVIEW_H_
 #define _FPDFVIEW_H_
 
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 // Function: FPDF_VIEWERREF_GetDuplex
 //                      Returns the paper handling option to be used when printing from print dialog.
 // Parameters:
 //                      document        -       Handle to the loaded document.
 // Return value:
 //          The paper handling option to be used when printing.
 //
 DLLEXPORT FPDF_DUPLEXTYPE STDCALL FPDF_VIEWERREF_GetDuplex(FPDF_DOCUMENT document);
 
+// Function: FPDF_CountNamedDests
+//                      Get the count of named destinations in the PDF document.
+// Parameters:
+//                      document        -       Handle to a document
+// Return value:
+//                      The count of named destinations.
+DLLEXPORT FPDF_DWORD STDCALL FPDF_CountNamedDests(FPDF_DOCUMENT document);
+
 // Function: FPDF_GetNamedDestByName
 //                      get a special dest handle by the index.
 // Parameters: 
 //                      document        -       Handle to the loaded document.
 //                      name            -       The name of a special named dest.
 // Return value:
 //                      The handle of the dest.
 //
 DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDestByName(FPDF_DOCUMENT document,FPDF_BYTESTRING name);
 
+// Function: FPDF_GetNamedDest
+//                      Get the specified named destinations of the PDF document by index.
+// Parameters:
+//                      document        -       Handle to a document
+//                      index           -       The index of named destination.
+//                      buffer          -       The buffer to obtain destination name, used as wchar_t*.
+//                      buflen          -       The length of the buffer in byte.
+// Return value:
+//                      The destination handle of a named destination, NULL when retrieving the length.
+// Comments:
+//                      Call this function twice to get the name of the named destination:
+//                      1) First time pass in |buffer| as NULL and get buflen.
+//                      2) Second time pass in allocated |buffer| and buflen to retrieve |buffer|, which should be used as wchar_t*.
+//                         If buflen is not sufficiently large, it will be returned as -1.
+//
+DLLEXPORT FPDF_DEST STDCALL FPDF_GetNamedDest(FPDF_DOCUMENT document, int index, void* buffer, unsigned long& buflen);
+
+
 #ifdef __cplusplus
 };
 #endif
 
 #endif // _FPDFVIEW_H_