allow Skia to be the default graphics engine

core/fxge/agg/fx_agg_driver.cpp

 // 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
 
 #include "core/fxge/agg/fx_agg_driver.h"
 
 #include <algorithm>
 
@@ skipping 1776 matching lines @@
   return ((CFX_ImageRenderer*)pHandle)->Continue(pPause);
 }
 
 void CFX_AggDeviceDriver::CancelDIBits(void* pHandle) {
   if (!m_pBitmap->GetBuffer()) {
     return;
   }
   delete (CFX_ImageRenderer*)pHandle;
 }
 
+#ifndef _SKIA_SUPPORT_
 CFX_FxgeDevice::CFX_FxgeDevice() {
   m_bOwnedBitmap = FALSE;
 }
 
 bool CFX_FxgeDevice::Attach(CFX_DIBitmap* pBitmap,
                             int dither_bits,
                             bool bRgbByteOrder,
                             CFX_DIBitmap* pOriDevice,
                             bool bGroupKnockout) {
   if (!pBitmap) {
@@ skipping 22 matching lines @@
       new CFX_AggDeviceDriver(pBitmap, dither_bits, FALSE, pOriDevice, FALSE);
   SetDeviceDriver(pDriver);
   return true;
 }
 
 CFX_FxgeDevice::~CFX_FxgeDevice() {
   if (m_bOwnedBitmap) {
     delete GetBitmap();
   }
 }
+#endif