Make printing build on Win64

printing/pdf_metafile_skia.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "printing/pdf_metafile_skia.h"
 
 #include "base/file_descriptor_posix.h"
 #include "base/file_util.h"
 #include "base/hash_tables.h"
 #include "base/metrics/histogram.h"
 #include "base/posix/eintr_wrapper.h"
+#include "base/safe_numerics.h"
 #include "skia/ext/vector_platform_device_skia.h"
 #include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "third_party/skia/include/core/SkScalar.h"
 #include "third_party/skia/include/core/SkStream.h"
 #include "third_party/skia/include/core/SkTypeface.h"
 #include "third_party/skia/include/pdf/SkPDFDevice.h"
 #include "third_party/skia/include/pdf/SkPDFDocument.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
@@ skipping 81 matching lines @@
       UMA_HISTOGRAM_ENUMERATION(
           "PrintPreview.FontType", type,
           SkAdvancedTypefaceMetrics::kNotEmbeddable_Font + 1);
     }
   }
 
   return data_->pdf_doc_.emitPDF(&data_->pdf_stream_);
 }
 
 uint32 PdfMetafileSkia::GetDataSize() const {
-  return data_->pdf_stream_.getOffset();
+  return base::checked_numeric_cast<uint32>(data_->pdf_stream_.getOffset());
 }
 
 bool PdfMetafileSkia::GetData(void* dst_buffer,
                               uint32 dst_buffer_size) const {
   if (dst_buffer_size < GetDataSize())
     return false;
 
   SkAutoDataUnref data(data_->pdf_stream_.copyToData());
   memcpy(dst_buffer, data->bytes(), dst_buffer_size);
   return true;
@@ skipping 107 matching lines @@
     return NULL;
 
   if (!pdf_doc.emitPDF(&pdf_stream))
     return NULL;
 
   SkAutoDataUnref data(pdf_stream.copyToData());
   if (data->size() == 0)
     return NULL;
 
   PdfMetafileSkia* metafile = new PdfMetafileSkia;
-  metafile->InitFromData(data->bytes(), data->size());
+  metafile->InitFromData(data->bytes(),
+                         base::checked_numeric_cast<uint32>(data->size()));
   return metafile;
 }
 
 }  // namespace printing