add native draw bitmap with alpha mask

core/fxge/include/ifx_renderdevicedriver.h

 // 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_FXGE_INCLUDE_IFX_RENDERDEVICEDRIVER_H_
 #define CORE_FXGE_INCLUDE_IFX_RENDERDEVICEDRIVER_H_
 
 #include "core/fxcrt/include/fx_system.h"
@@ skipping 81 matching lines @@
                                  FX_FLOAT font_size,
                                  uint32_t color);
   virtual void* GetPlatformSurface() const;
   virtual int GetDriverType() const;
   virtual void ClearDriver();
   virtual FX_BOOL DrawShading(const CPDF_ShadingPattern* pPattern,
                               const CFX_Matrix* pMatrix,
                               const FX_RECT& clip_rect,
                               int alpha,
                               FX_BOOL bAlphaMode);
+  virtual bool SetBitsWithMask(const CFX_DIBSource* pBitmap,
+                               const CFX_DIBSource* pMask,
+                               int left,
+                               int top,
+                               int bitmap_alpha,
+                               int blend_type);
 };
 
 #endif  // CORE_FXGE_INCLUDE_IFX_RENDERDEVICEDRIVER_H_