Summary: For percentage paddings/margins/sizes to work on the root node we need to have the ability to pass down the parent sizes. This has always been possible with the C API but was never exposed to java. This diff exposes this functionality. Reviewed By: astreet Differential Revision: D4501016 fbshipit-source-id: 0c9502e86ff200c021c78afb7ac4b48cf11b3bdb