Enables HiDPI favicon to be displayed in tab strip on CrOS

ui/gfx/image/image_skia_unittest.cc

Index: ui/gfx/image/image_skia_unittest.cc
diff --git a/ui/gfx/image/image_skia_unittest.cc b/ui/gfx/image/image_skia_unittest.cc
index 118c858bfad011fab820d72cd485bd01ec74cb19..7d49c0a6a1b1b9704f4be0835f65997c5f4925a3 100644
--- a/ui/gfx/image/image_skia_unittest.cc
+++ b/ui/gfx/image/image_skia_unittest.cc
@@ -173,4 +173,22 @@ TEST(ImageSkiaTest, GetBitmap) {
   EXPECT_FALSE(bitmap->isNull());
 }
 
+TEST(ImageSkiaTest, Equals) {
+  // Null images should all be equal.
+  ImageSkia image;
+  ImageSkia unrelated;
+  EXPECT_TRUE(image.Equals(unrelated));
+
+  image.AddRepresentation(gfx::ImageSkiaRep(gfx::Size(10, 10),
+                                            ui::SCALE_FACTOR_100P));
+  ImageSkia copy = image;
+  copy.AddRepresentation(gfx::ImageSkiaRep(gfx::Size(10, 10),
+                                           ui::SCALE_FACTOR_200P));
+  unrelated.AddRepresentation(gfx::ImageSkiaRep(gfx::Size(10, 10),
+                                                ui::SCALE_FACTOR_100P));
+  EXPECT_TRUE(image.Equals(copy));
+  EXPECT_FALSE(image.Equals(unrelated));
+  EXPECT_FALSE(copy.Equals(unrelated));
+}
+
 }  // namespace gfx