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diff --git a/fpdfsdk/cpdfsdk_helpers.h b/fpdfsdk/cpdfsdk_helpers.h
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+++ b/fpdfsdk/cpdfsdk_helpers.h
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+// 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 FPDFSDK_CPDFSDK_HELPERS_H_
+#define FPDFSDK_CPDFSDK_HELPERS_H_
+
+#include "core/fpdfapi/parser/cpdf_parser.h"
+#include "core/fxge/dib/cfx_dibitmap.h"
+#include "core/fxge/fx_dib.h"
+#include "public/fpdf_doc.h"
+#include "public/fpdfview.h"
+
+#ifdef PDF_ENABLE_XFA
+#include "fpdfsdk/fpdfxfa/cpdfxfa_context.h"
+#endif  // PDF_ENABLE_XFA
+
+#ifdef _WIN32
+#include <math.h>
+#include <tchar.h>
+#endif
+
+class CPDF_Annot;
+class CPDF_Page;
+class CPDF_PageObject;
+class CPDF_PageRenderContext;
+class CPDF_PathObject;
+class CPDF_Stream;
+class IFSDK_PAUSE_Adapter;
+class FX_PATHPOINT;
+
+// Object types for public FPDF_ types; these correspond to next layer down
+// from fpdfsdk. For master, these are CPDF_ types, but for XFA, these are
+// CPDFXFA_ types.
+#ifndef PDF_ENABLE_XFA
+using UnderlyingDocumentType = CPDF_Document;
+using UnderlyingPageType = CPDF_Page;
+#else   // PDF_ENABLE_XFA
+using UnderlyingDocumentType = CPDFXFA_Context;
+using UnderlyingPageType = CPDFXFA_Page;
+#endif  // PDF_ENABLE_XFA
+
+// Conversions to/from underlying types.
+UnderlyingDocumentType* UnderlyingFromFPDFDocument(FPDF_DOCUMENT doc);
+
+UnderlyingPageType* UnderlyingFromFPDFPage(FPDF_PAGE page);
+
+// Conversions to/from FPDF_ types.
+CPDF_Document* CPDFDocumentFromFPDFDocument(FPDF_DOCUMENT doc);
+FPDF_DOCUMENT FPDFDocumentFromCPDFDocument(CPDF_Document* doc);
+
+CPDF_Page* CPDFPageFromFPDFPage(FPDF_PAGE page);
+CPDF_PageObject* CPDFPageObjectFromFPDFPageObject(FPDF_PAGEOBJECT page_object);
+ByteString CFXByteStringFromFPDFWideString(FPDF_WIDESTRING wide_string);
+CFX_DIBitmap* CFXBitmapFromFPDFBitmap(FPDF_BITMAP bitmap);
+
+#ifdef PDF_ENABLE_XFA
+// Layering prevents fxcrt from knowing about FPDF_FILEHANDLER, so this can't
+// be a static method of IFX_SeekableStream.
+RetainPtr<IFX_SeekableStream> MakeSeekableStream(
+    FPDF_FILEHANDLER* pFileHandler);
+#endif  // PDF_ENABLE_XFA
+
+const CPDF_Array* GetQuadPointsArrayFromDictionary(CPDF_Dictionary* dict);
+bool GetQuadPointsFromDictionary(CPDF_Dictionary* dict,
+                                 size_t quad_index,
+                                 FS_QUADPOINTSF* quad_points);
+
+CFX_FloatRect CFXFloatRectFromFSRECTF(const FS_RECTF& rect);
+void FSRECTFFromCFXFloatRect(const CFX_FloatRect& rect, FS_RECTF* out_rect);
+
+unsigned long Utf16EncodeMaybeCopyAndReturnLength(const WideString& text,
+                                                  void* buffer,
+                                                  unsigned long buflen);
+unsigned long DecodeStreamMaybeCopyAndReturnLength(const CPDF_Stream* stream,
+                                                   void* buffer,
+                                                   unsigned long buflen);
+
+void FSDK_SetSandBoxPolicy(FPDF_DWORD policy, FPDF_BOOL enable);
+FPDF_BOOL FSDK_IsSandBoxPolicyEnabled(FPDF_DWORD policy);
+
+// TODO(dsinclair): Where should this live?
+void FPDF_RenderPage_Retail(CPDF_PageRenderContext* pContext,
+                            FPDF_PAGE page,
+                            int start_x,
+                            int start_y,
+                            int size_x,
+                            int size_y,
+                            int rotate,
+                            int flags,
+                            bool bNeedToRestore,
+                            IFSDK_PAUSE_Adapter* pause);
+
+void CheckUnSupportError(CPDF_Document* pDoc, uint32_t err_code);
+void CheckUnSupportAnnot(CPDF_Document* pDoc, const CPDF_Annot* pPDFAnnot);
+
+#ifndef _WIN32
+void SetLastError(int err);
+int GetLastError();
+#endif  // _WIN32
+
+void ProcessParseError(CPDF_Parser::Error err);
+
+// TODO(dsinclair): This seems like it should be a public API?
+FPDF_BOOL FPDFPageObj_SetFillColor(FPDF_PAGEOBJECT page_object,
+                                   unsigned int R,
+                                   unsigned int G,
+                                   unsigned int B,
+                                   unsigned int A);
+
+#endif  // FPDFSDK_CPDFSDK_HELPERS_H_