Use SkPngEncoder in gfx jpeg_codec

ui/gfx/codec/png_codec.h

Index: ui/gfx/codec/png_codec.h
diff --git a/ui/gfx/codec/png_codec.h b/ui/gfx/codec/png_codec.h
index 335b58affb051041b480d876cff5f13e37674489..db63c54f734f08264933182602611aac6d15b8c9 100644
--- a/ui/gfx/codec/png_codec.h
+++ b/ui/gfx/codec/png_codec.h
@@ -11,6 +11,8 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "third_party/skia/include/core/SkImageInfo.h"
+#include "third_party/skia/include/core/SkPixmap.h"
 #include "ui/gfx/codec/codec_export.h"
 
 class SkBitmap;
@@ -51,28 +53,16 @@ class CODEC_EXPORT PNGCodec {
     std::string text;
   };
 
-  // Encodes the given raw 'input' data, with each pixel being represented as
-  // given in 'format'. The encoded PNG data will be written into the supplied
-  // vector and true will be returned on success. On failure (false), the
-  // contents of the output buffer are undefined.
+  // Encodes the given raw 'input' pixmap, which includes a pointer to pixels as
+  // well as information describing the pixel format. The encoded PNG data will
+  // be written into the supplied vector and true will be returned on success.
+  // On failure (false), the contents of the output buffer are undefined.
   //
   // When writing alpha values, the input colors are assumed to be post
   // multiplied.
   //
-  // size: dimensions of the image
-  // row_byte_width: the width in bytes of each row. This may be greater than
-  //   w * bytes_per_pixel if there is extra padding at the end of each row
-  //   (often, each row is padded to the next machine word).
-  // discard_transparency: when true, and when the input data format includes
-  //   alpha values, these alpha values will be discarded and only RGB will be
-  //   written to the resulting file. Otherwise, alpha values in the input
-  //   will be preserved.
   // comments: comments to be written in the png's metadata.
-  static bool Encode(const unsigned char* input,
-                     ColorFormat format,
-                     const Size& size,
-                     int row_byte_width,
-                     bool discard_transparency,
+  static bool Encode(const SkPixmap& input,
                      const std::vector<Comment>& comments,
                      std::vector<unsigned char>* output);