Add support for PNG representation in gfx::Image

ui/gfx/image/image_util.cc

Index: ui/gfx/image/image_util.cc
diff --git a/ui/gfx/image/image_util.cc b/ui/gfx/image/image_util.cc
index 04cffca50865c186a81d05f0c025128d2b4c9164..61a77502bbdf0de1b5d7c6d83c7689be25a08761 100644
--- a/ui/gfx/image/image_util.cc
+++ b/ui/gfx/image/image_util.cc
@@ -7,17 +7,18 @@
 #include "base/memory/scoped_ptr.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/codec/jpeg_codec.h"
-#include "ui/gfx/codec/png_codec.h"
 #include "ui/gfx/image/image.h"
+#include "ui/gfx/image/image_skia.h"
 
 namespace gfx {
 
 Image* ImageFromPNGEncodedData(const unsigned char* input, size_t input_size) {
-  SkBitmap bitmap;
-  if (gfx::PNGCodec::Decode(input, input_size, &bitmap))
-    return new Image(bitmap);
-
-  return NULL;
+  Image* image = new Image(input, input_size);
+  // Check if image can be converted to an ImageSkia and return NULL if
+  // conversion fails.
+  if (image->ToImageSkia()->empty())
+    return NULL;
+  return image;
 }
 
 Image ImageFromJPEGEncodedData(const unsigned char* input, size_t input_size) {
@@ -30,8 +31,8 @@ Image ImageFromJPEGEncodedData(const unsigned char* input, size_t input_size) {
 
 bool PNGEncodedDataFromImage(const Image& image,
                              std::vector<unsigned char>* dst) {
-  const SkBitmap& bitmap = *image.ToSkBitmap();
-  return gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, false, dst);
+  *dst = *image.ToImagePNG();
+  return !dst->empty();
 }
 
 bool JPEGEncodedDataFromImage(const Image& image, int quality,