experimental/tools/coreGraphicsPdf2png: fix

experimental/tools/coreGraphicsPdf2png.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <stdio.h>
 
 #include "SkBitmap.h"
 #include "SkCGUtils.h"
+#include "SkForceLinking.h"
 #include "SkImageEncoder.h"
 #include "SkStream.h"
 
+__SK_FORCE_IMAGE_DECODER_LINKING;
+
 class StdOutWStream : public SkWStream {
 public:
     StdOutWStream() : fBytesWritten(0) {}
     bool write(const void* buffer, size_t size) final {
         fBytesWritten += size;
         return size == fwrite(buffer, 1, size, stdout);
     }
     size_t bytesWritten() const final { return fBytesWritten; }
 
 private:
@@ skipping 23 matching lines @@
 int main(int argc, char** argv) {
     SkBitmap bm;
     SkAutoTDelete<SkStream> in(open_for_reading(argc > 1 ? argv[1] : NULL));
     SkAutoTDelete<SkWStream> out(open_for_writing(argc > 2 ? argv[2] : NULL));
     if (SkPDFDocumentToBitmap(in.release(), &bm) && to_png(out, bm)) {
         return 0;
     } else {
         return 1;
     }
 }