Update comment for ImageSkiaRep(gfx::Size, float);

ui/gfx/image/image_skia_rep.h

Index: ui/gfx/image/image_skia_rep.h
diff --git a/ui/gfx/image/image_skia_rep.h b/ui/gfx/image/image_skia_rep.h
index 7b70967d0381eb5e68bfd096c8046402a73a287a..47f6713acf5d0a87fddd5020badd1c05c9ad783c 100644
--- a/ui/gfx/image/image_skia_rep.h
+++ b/ui/gfx/image/image_skia_rep.h
@@ -20,8 +20,10 @@ class GFX_EXPORT ImageSkiaRep {
   ImageSkiaRep();
   ~ImageSkiaRep();
 
+  // Note: This is for testing purpose only.
   // Creates a bitmap with kARGB_8888_Config config with given |size| in DIP.
-  // This allocates pixels in the bitmap and fill the bitmap with a color.
+  // This allocates pixels in the bitmap. It is guaranteed that the data in the
+  // bitmap are initialized but the actual values are undefined.

[oshima, 2014/05/16 14:48:39]

I think it's better not to mention how it's initialized because the user do not
have to know, and should not depend on it.

   // Specifying 0 scale means the image is for unscaled image. (unscaled()
   // returns truen, and scale() returns 1.0f;)
   ImageSkiaRep(const gfx::Size& size, float scale);