add native draw bitmap with alpha mask

core/fxge/ge/cfx_renderdevice.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/cfx_renderdevice.h"
 
 #include "core/fxge/include/cfx_fxgedevice.h"
 #include "core/fxge/include/cfx_graphstatedata.h"
@@ skipping 793 matching lines @@
 
 FX_BOOL CFX_RenderDevice::ContinueDIBits(void* handle, IFX_Pause* pPause) {
   return m_pDeviceDriver->ContinueDIBits(handle, pPause);
 }
 
 void CFX_RenderDevice::CancelDIBits(void* handle) {
   m_pDeviceDriver->CancelDIBits(handle);
 }
 
 #ifdef _SKIA_SUPPORT_
-
 void CFX_RenderDevice::DebugVerifyBitmapIsPreMultiplied() const {
   SkASSERT(0);
 }
+
+bool CFX_RenderDevice::SetBitsWithMask(const CFX_DIBSource* pBitmap,
+                                       const CFX_DIBSource* pMask,
+                                       int left,
+                                       int top,
+                                       int bitmap_alpha,
+                                       int blend_type) {
+  return m_pDeviceDriver->SetBitsWithMask(pBitmap, pMask, left, top,
+                                          bitmap_alpha, blend_type);
+}
 #endif
 
 FX_BOOL CFX_RenderDevice::DrawNormalText(int nChars,
                                          const FXTEXT_CHARPOS* pCharPos,
                                          CFX_Font* pFont,
                                          CFX_FontCache* pCache,
                                          FX_FLOAT font_size,
                                          const CFX_Matrix* pText2Device,
                                          uint32_t fill_color,
                                          uint32_t text_flags) {
@@ skipping 235 matching lines @@
                              fill_color, stroke_color, fill_mode,
                              FXDIB_BLEND_NORMAL)) {
         return FALSE;
       }
     }
     if (pClippingPath)
       pClippingPath->Append(&TransformedPath, pUser2Device);
   }
   return TRUE;
 }