Add the ability to write comments to PNGCodec::Encode.

printing/image.cc

 // Copyright (c) 2011 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/image.h"
 
 #include "base/file_util.h"
 #include "base/md5.h"
 #include "base/scoped_ptr.h"
 #include "base/string_number_conversions.h"
@@ skipping 42 matching lines @@
   MD5Digest digest;
   MD5Sum(&data_[0], data_.size(), &digest);
   return base::HexEncode(&digest, sizeof(digest));
 }
 
 bool Image::SaveToPng(const FilePath& filepath) const {
   DCHECK(!data_.empty());
   std::vector<unsigned char> compressed;
   bool success = gfx::PNGCodec::Encode(&*data_.begin(),
                                        gfx::PNGCodec::FORMAT_BGRA,
-                                       size_.width(),
-                                       size_.height(),
+                                       size_,
                                        row_length_,
                                        true,
+                                       std::vector<gfx::PNGCodec::Comment>(),
                                        &compressed);
   DCHECK(success && compressed.size());
   if (success) {
     int write_bytes = file_util::WriteFile(
         filepath,
         reinterpret_cast<char*>(&*compressed.begin()), compressed.size());
     success = (write_bytes == static_cast<int>(compressed.size()));
     DCHECK(success);
   }
   return success;
@@ skipping 69 matching lines @@
 
 bool Image::LoadMetafile(const std::string& data) {
   DCHECK(!data.empty());
   scoped_ptr<NativeMetafile> metafile(
       printing::NativeMetafileFactory::Create());
   metafile->InitFromData(data.data(), data.size());
   return LoadMetafile(*metafile);
 }
 
 }  // namespace printing