Make code compile with clang_use_chrome_plugin (part I)

core/fpdfapi/fpdf_render/fpdf_render_image.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/fpdfapi/fpdf_render/render_int.h"
 
 #include <utility>
 #include <vector>
@@ skipping 161 matching lines @@
 FXDIB_Format CPDF_DIBTransferFunc::GetDestFormat() {
   if (m_pSrc->IsAlphaMask()) {
     return FXDIB_8bppMask;
   }
 #if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
   return (m_pSrc->HasAlpha()) ? FXDIB_Argb : FXDIB_Rgb32;
 #else
   return (m_pSrc->HasAlpha()) ? FXDIB_Argb : FXDIB_Rgb;
 #endif
 }
+
+FX_ARGB* CPDF_DIBTransferFunc::GetDestPalette() {
+  return nullptr;
+}
+
 CPDF_DIBTransferFunc::CPDF_DIBTransferFunc(
     const CPDF_TransferFunc* pTransferFunc) {
   m_RampR = pTransferFunc->m_Samples;
   m_RampG = &pTransferFunc->m_Samples[256];
   m_RampB = &pTransferFunc->m_Samples[512];
 }
 void CPDF_DIBTransferFunc::TranslateScanline(uint8_t* dest_buf,
                                              const uint8_t* src_buf) const {
   int i;
   FX_BOOL bSkip = FALSE;
@@ skipping 818 matching lines @@
   } else if (pFunc) {
     int size = dest_pitch * height;
     for (int i = 0; i < size; i++) {
       dest_buf[i] = transfers[src_buf[i]];
     }
   } else {
     FXSYS_memcpy(dest_buf, src_buf, dest_pitch * height);
   }
   return pMask.release();
 }