ImageLayer is almost the only usage of Image, so keeping them in the same enum makes the resulting C++ struct smaller, and makes it map more cleanly to nsStyleImage. Differential Revision: https://phabricator.services.mozilla.com/D62161
ImageLayer is almost the only usage of Image, so keeping them in the same enum makes the resulting C++ struct smaller, and makes it map more cleanly to nsStyleImage. Differential Revision: https://phabricator.services.mozilla.com/D62161