add native draw bitmap with alpha mask

core/fxge/ifx_renderdevicedriver.cpp

 // 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
 
 #include "core/fxge/include/ifx_renderdevicedriver.h"
 
 #include "core/fxcrt/include/fx_coordinates.h"
 #include "core/fxge/include/cfx_pathdata.h"
@@ skipping 74 matching lines @@
 
 void IFX_RenderDeviceDriver::ClearDriver() {}
 
 FX_BOOL IFX_RenderDeviceDriver::DrawShading(const CPDF_ShadingPattern* pPattern,
                                             const CFX_Matrix* pMatrix,
                                             const FX_RECT& clip_rect,
                                             int alpha,
                                             FX_BOOL bAlphaMode) {
   return false;
 }
+
+bool IFX_RenderDeviceDriver::SetBitsWithMask(const CFX_DIBSource* pBitmap,
+                                             const CFX_DIBSource* pMask,
+                                             int left,
+                                             int top,
+                                             int bitmap_alpha,
+                                             int blend_type) {
+  return false;
+}