Pass style res to @OnCreateMountContent about litho

[dmayle]

There's no "supported" way of doing this. the obtainStyledAttributes() method used to retrieve custom attributes is implemented in ResourcesImpl.java (in AOSP) and it casts the received attribute set to XmlBlock.Parser, which is a package private final class that has hooks into native code. If you were willing to use reflection to hack into these classes and hook into the classloader to do runtime injection inheriting from the classes unlocked by reflection, it would theoretically be possible... but the effort required is staggeringly large