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diff --git a/core/fpdfapi/render/cpdf_progressiverenderer.h b/core/fpdfapi/render/cpdf_progressiverenderer.h
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index 0000000000..2cf84e97f3
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+++ b/core/fpdfapi/render/cpdf_progressiverenderer.h
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+// Copyright 2016 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 CORE_FPDFAPI_RENDER_CPDF_PROGRESSIVERENDERER_H_
+#define CORE_FPDFAPI_RENDER_CPDF_PROGRESSIVERENDERER_H_
+
+#include <memory>
+
+#include "core/fpdfapi/page/cpdf_pageobjectlist.h"
+#include "core/fpdfapi/render/cpdf_rendercontext.h"
+#include "core/fxcrt/fx_coordinates.h"
+#include "core/fxcrt/fx_system.h"
+
+class CPDF_RenderOptions;
+class CPDF_RenderStatus;
+class CFX_RenderDevice;
+class IFX_Pause;
+
+class CPDF_ProgressiveRenderer {
+ public:
+  // Must match FDF_RENDER_* definitions in public/fpdf_progressive.h, but
+  // cannot #include that header. fpdfsdk/fpdf_progressive.cpp has
+  // static_asserts to make sure the two sets of values match.
+  enum Status {
+    Ready,          // FPDF_RENDER_READER
+    ToBeContinued,  // FPDF_RENDER_TOBECOUNTINUED
+    Done,           // FPDF_RENDER_DONE
+    Failed          // FPDF_RENDER_FAILED
+  };
+
+  static int ToFPDFStatus(Status status) { return static_cast<int>(status); }
+
+  CPDF_ProgressiveRenderer(CPDF_RenderContext* pContext,
+                           CFX_RenderDevice* pDevice,
+                           const CPDF_RenderOptions* pOptions);
+  ~CPDF_ProgressiveRenderer();
+
+  Status GetStatus() const { return m_Status; }
+  void Start(IFX_Pause* pPause);
+  void Continue(IFX_Pause* pPause);
+
+ private:
+  void RenderStep();
+
+  // Maximum page objects to render before checking for pause.
+  static const int kStepLimit = 100;
+
+  Status m_Status;
+  CPDF_RenderContext* const m_pContext;
+  CFX_RenderDevice* const m_pDevice;
+  const CPDF_RenderOptions* const m_pOptions;
+  std::unique_ptr<CPDF_RenderStatus> m_pRenderStatus;
+  CFX_FloatRect m_ClipRect;
+  uint32_t m_LayerIndex;
+  CPDF_RenderContext::Layer* m_pCurrentLayer;
+  CPDF_PageObjectList::iterator m_LastObjectRendered;
+};
+
+#endif  // CORE_FPDFAPI_RENDER_CPDF_PROGRESSIVERENDERER_H_