Update pdfium for windows

dependencies/pdfium/win/public/fpdf_thumbnail.h

@@ -0,0 +1,59 @@
+// Copyright 2019 The PDFium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PUBLIC_FPDF_THUMBNAIL_H_
+#define PUBLIC_FPDF_THUMBNAIL_H_
+
+#include <stdint.h>
+
+// NOLINTNEXTLINE(build/include)
+#include "fpdfview.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Experimental API.
+// Gets the decoded data from the thumbnail of |page| if it exists.
+// This only modifies |buffer| if |buflen| less than or equal to the
+// size of the decoded data. Returns the size of the decoded
+// data or 0 if thumbnail DNE. Optional, pass null to just retrieve
+// the size of the buffer needed.
+//
+//   page    - handle to a page.
+//   buffer  - buffer for holding the decoded image data.
+//   buflen  - length of the buffer in bytes.
+FPDF_EXPORT unsigned long FPDF_CALLCONV
+FPDFPage_GetDecodedThumbnailData(FPDF_PAGE page,
+                                 void* buffer,
+                                 unsigned long buflen);
+
+// Experimental API.
+// Gets the raw data from the thumbnail of |page| if it exists.
+// This only modifies |buffer| if |buflen| is less than or equal to
+// the size of the raw data. Returns the size of the raw data or 0
+// if thumbnail DNE. Optional, pass null to just retrieve the size
+// of the buffer needed.
+//
+//   page    - handle to a page.
+//   buffer  - buffer for holding the raw image data.
+//   buflen  - length of the buffer in bytes.
+FPDF_EXPORT unsigned long FPDF_CALLCONV
+FPDFPage_GetRawThumbnailData(FPDF_PAGE page,
+                             void* buffer,
+                             unsigned long buflen);
+
+// Experimental API.
+// Returns the thumbnail of |page| as a FPDF_BITMAP. Returns a nullptr
+// if unable to access the thumbnail's stream.
+//
+//   page - handle to a page.
+FPDF_EXPORT FPDF_BITMAP FPDF_CALLCONV
+FPDFPage_GetThumbnailAsBitmap(FPDF_PAGE page);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // PUBLIC_FPDF_THUMBNAIL_H_