This makes it so that when we are flattening xml files we figure out which elements have the featureFlag attribute and persist that in the binary xml. Then at runtime we can quickly check that before we try and find the actual attribute. Test: Automation Flag: android.content.res.layout_readwrite_flags Bug: 398541237 Change-Id: I1015dd45c4a0ba38bea75cad30b59cec4a05d825