Make code compile with clang_use_chrome_plugin (part III)

xfa/fxbarcode/BC_BufferedImageLuminanceSource.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
 // Original code is licensed as follows:
 /*
  * Copyright 2009 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ skipping 12 matching lines @@
 #include <memory>
 
 #include "core/fxcodec/codec/include/ccodec_progressivedecoder.h"
 #include "core/fxcodec/include/fx_codec.h"
 #include "xfa/fxbarcode/BC_BufferedImageLuminanceSource.h"
 #include "xfa/fxbarcode/BC_LuminanceSource.h"
 #include "xfa/fxbarcode/utils.h"
 
 class CBC_Pause : public IFX_Pause {
  public:
-  virtual FX_BOOL NeedToPauseNow() { return TRUE; }
+  // IFX_Pause
+  FX_BOOL NeedToPauseNow() override;
 };
 
 static CFX_DIBitmap* CreateDIBSource(IFX_FileRead* fileread) {
   std::unique_ptr<CCodec_ModuleMgr> pCodecMgr(new CCodec_ModuleMgr());
   std::unique_ptr<CCodec_ProgressiveDecoder> pImageCodec(
       pCodecMgr->CreateProgressiveDecoder());
   FXCODEC_STATUS status = FXCODEC_STATUS_DECODE_FINISH;
   status = pImageCodec->LoadImageInfo(fileread, FXCODEC_IMAGE_UNKNOWN, nullptr,
                                       false);
   if (status != FXCODEC_STATUS_FRAME_READY)
@@ skipping 103 matching lines @@
       int32_t pixel = rgb[offset + x];
       int32_t luminance =
           (306 * ((pixel >> 16) & 0xFF) + 601 * ((pixel >> 8) & 0xFF) +
            117 * (pixel & 0xFF)) >>
           10;
       (*matrix)[offset + x] = (uint8_t)luminance;
     }
   }
   return matrix;
 }
+
+FX_BOOL CBC_Pause::NeedToPauseNow() {
+  return TRUE;
+}