Update the pdfium library

Note: pdfium does not have releases, rather the repository is
      kept up-to-date. This was pulled on: 6/4/2015.

Change-Id: I3c6d77fa1f7c6da2b7df3c4e5c00093900125bc2
diff --git a/public/fpdf_ppo.h b/public/fpdf_ppo.h
new file mode 100644
index 0000000..2e033f1
--- /dev/null
+++ b/public/fpdf_ppo.h
@@ -0,0 +1,42 @@
+// 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 PUBLIC_FPDF_PPO_H_
+#define PUBLIC_FPDF_PPO_H_
+
+#include "fpdfview.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Function: FPDF_ImportPages
+//          Import some pages to a PDF document.
+// Parameters:
+//          dest_doc    -   The destination document which add the pages.
+//          src_doc     -   A document to be imported.
+//          pagerange   -   A page range string, Such as "1,3,5-7".
+//                          If this parameter is NULL, it would import all pages in src_doc.
+//          index       -   The page index wanted to insert from.
+// Return value:
+//          TRUE for succeed, FALSE for Failed.
+DLLEXPORT FPDF_BOOL STDCALL FPDF_ImportPages(FPDF_DOCUMENT dest_doc,FPDF_DOCUMENT src_doc, FPDF_BYTESTRING pagerange, int index);
+
+
+// Function: FPDF_CopyViewerPreferences
+//          Copy the viewer preferences from one PDF document to another.#endif
+// Parameters:
+//          dest_doc    -   Handle to document to write the viewer preferences to.
+//          src_doc     -   Handle to document with the viewer preferences.
+// Return value:
+//          TRUE for success, FALSE for failure.
+DLLEXPORT FPDF_BOOL STDCALL FPDF_CopyViewerPreferences(FPDF_DOCUMENT dest_doc, FPDF_DOCUMENT src_doc);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // PUBLIC_FPDF_PPO_H_