Introduces ImageSkia::GetRepresentations() for Mac

ui/gfx/image/image_skia.h

Index: ui/gfx/image/image_skia.h
diff --git a/ui/gfx/image/image_skia.h b/ui/gfx/image/image_skia.h
index e6ab0acdd599ea224d3b9df9c9a5697014b54b27..e0b39ff3b522ca4770f516e5f02224b4cf5149eb 100644
--- a/ui/gfx/image/image_skia.h
+++ b/ui/gfx/image/image_skia.h
@@ -73,9 +73,9 @@ class UI_EXPORT ImageSkia {
   // Removes the image rep of |scale_factor| if present.
   void RemoveRepresentation(ui::ScaleFactor scale_factor);
 
-  // Returns true if the object owns a image rep whose density matches
+  // Returns true if the object owns an image rep whose density matches
   // |scale_factor| exactly.
-  bool HasRepresentation(ui::ScaleFactor scale_factor);
+  bool HasRepresentation(ui::ScaleFactor scale_factor) const;
 
   // Returns the image rep whose density best matches
   // |scale_factor|.
@@ -83,6 +83,11 @@ class UI_EXPORT ImageSkia {
   const gfx::ImageSkiaRep& GetRepresentation(
       ui::ScaleFactor scale_factor) const;
 
+  // Returns the image reps contained by this object.
+  // If the image has a source, this method will attempt to generate
+  // representations from the source for all supported scale factors.
+  std::vector<ImageSkiaRep> GetRepresentations() const;
+
   // Returns true if object is null or its size is empty.
   bool empty() const;
 
@@ -95,16 +100,17 @@ class UI_EXPORT ImageSkia {
   int height() const;
   gfx::Size size() const;
 
-  // Wrapper function for SkBitmap::extractBitmap.
   // Operates on each stored image rep. Note that it may not have
   // all image reps for supported scale factors.
   // TODO(oshima|pkotwicz): Investigate if this can be eliminated
   // after ImageSkiaSource conversion.
   bool extractSubset(ImageSkia* dst, const SkIRect& subset) const;
 
-  // Returns pointer to an SkBitmap contained by this object.
-  // TODO(pkotwicz): This is temporary till conversion to gfx::ImageSkia is
-  // done.
+  // Returns pointer to 1x bitmap contained by this object. If there is no 1x
+  // bitmap, the bitmap whose scale factor is closest to 1x is returned.
+  // This function should only be used in unittests and on platforms which do
+  // not support scale factors other than 1x.
+  // TODO(pkotwicz): Return null SkBitmap when the object has no 1x bitmap.
   const SkBitmap* bitmap() const;
 
   // Returns a vector with the image reps contained in this object.