Expose array of bitmaps contained by gfx::Image similar to NSImage

ui/gfx/image/image_mac_unittest.mm

Index: ui/gfx/image/image_mac_unittest.mm
diff --git a/ui/gfx/image/image_mac_unittest.mm b/ui/gfx/image/image_mac_unittest.mm
index 0affe373406e657d846a3baa4cf2160234dc295c..d30349de366cca64c0e88e8cc0272ab54d60bbf1 100644
--- a/ui/gfx/image/image_mac_unittest.mm
+++ b/ui/gfx/image/image_mac_unittest.mm
@@ -9,6 +9,7 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/image/image.h"
+#include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/image/image_unittest_util.h"
 
 namespace {
@@ -48,11 +49,12 @@ TEST_F(ImageMacTest, MultiResolutionNSImageToSkBitmap) {
   gfx::Image image(ns_image.release());
 
   EXPECT_EQ(1u, image.RepresentationCount());
-  EXPECT_EQ(2u, image.GetNumberOfSkBitmaps());
+  gfx::ImageSkia* image_skia = image.ToImageSkia();
+  EXPECT_EQ(2u, image_skia->GetNumberOfBitmaps());
 
-  const SkBitmap* bitmap1 = image.GetSkBitmapAtIndex(0);
+  const SkBitmap* bitmap1 = image_skia->GetBitmapAtIndex(0);
   EXPECT_TRUE(bitmap1);
-  const SkBitmap* bitmap2 = image.GetSkBitmapAtIndex(1);
+  const SkBitmap* bitmap2 = image_skia->GetBitmapAtIndex(1);
   EXPECT_TRUE(bitmap2);
 
   if (bitmap1->width() == width1) {
@@ -66,7 +68,7 @@ TEST_F(ImageMacTest, MultiResolutionNSImageToSkBitmap) {
     EXPECT_EQ(bitmap2->height(), height1);
   }
 
-  // GetNumberOfSkBitmaps and GetSkBitmapAtIndex should create a second
+  // GetNumberOfBitmaps and GetBitmapAtIndex should create a second
   // representation.
   EXPECT_EQ(2u, image.RepresentationCount());
 }