Add VectorIconButton functionality to ImageButton.

ui/views/controls/button/image_button.h

Index: ui/views/controls/button/image_button.h
diff --git a/ui/views/controls/button/image_button.h b/ui/views/controls/button/image_button.h
index eba2a835a40eff5f07a628558b2fe1fd5ad48b16..149a1eda5762ceed0faa65aa4515cf3a914f6516 100644
--- a/ui/views/controls/button/image_button.h
+++ b/ui/views/controls/button/image_button.h
@@ -103,6 +103,9 @@ class VIEWS_EXPORT ImageButton : public CustomButton {
   FRIEND_TEST_ALL_PREFIXES(ImageButtonTest, LeftAlignedMirrored);
   FRIEND_TEST_ALL_PREFIXES(ImageButtonTest, RightAlignedMirrored);
 
+  FRIEND_TEST_ALL_PREFIXES(ImageButtonUtilTest,
+                           CreateImageButtonWithVectorIconStyling);
+
   // Returns the correct position of the image for painting.
   gfx::Point ComputeImagePaintPosition(const gfx::ImageSkia& image);