Add support for PNG representation in gfx::Image

ui/gfx/image/image.h

Index: ui/gfx/image/image.h
diff --git a/ui/gfx/image/image.h b/ui/gfx/image/image.h
index c03db3ad18e783231e57e53712350e10e925f0c6..da3ff0090db0e38952ef28e22824eb959c087edd 100644
--- a/ui/gfx/image/image.h
+++ b/ui/gfx/image/image.h
@@ -55,6 +55,7 @@ class UI_EXPORT Image {
     kImageRepCocoa,
     kImageRepCairo,
     kImageRepSkia,
+    kImageRepPNG,
   };
 
   typedef std::map<RepresentationType, internal::ImageRep*> RepresentationMap;
@@ -62,6 +63,10 @@ class UI_EXPORT Image {
   // Creates an empty image with no representations.
   Image();
 
+  // Creates a new image by copying the png-encoded input for use as the default

[Robert Sesek, 2012/07/24 18:59:17]

nit: PNG

Also add a note about how to create this with a vector of bytes.

[cjhopman, 2012/07/25 21:13:29]

Done.

+  // representation.
+  Image(const unsigned char* png, size_t input_size);
+
   // Creates a new image by copying the ImageSkia for use as the default
   // representation.
   explicit Image(const ImageSkia& image);
@@ -98,6 +103,7 @@ class UI_EXPORT Image {
   // Converts the Image to the desired representation and stores it internally.
   // The returned result is a weak pointer owned by and scoped to the life of
   // the Image.
+  const std::vector<unsigned char>* ToImagePNG() const;
   const SkBitmap* ToSkBitmap() const;
   const ImageSkia* ToImageSkia() const;
 #if defined(TOOLKIT_GTK)
@@ -113,6 +119,7 @@ class UI_EXPORT Image {
   // backing pixels are shared amongst all copies (a fact of each of the
   // converted representations, rather than a limitation imposed by Image) and
   // so the result should be considered immutable.
+  std::vector<unsigned char>* CopyImagePNG() const;
   ImageSkia* CopyImageSkia() const;
   SkBitmap* CopySkBitmap() const;
 #if defined(TOOLKIT_GTK)