Summary: Set layout outputs on CSSNode from C after layout calculation finishes instead of relying on calling jni gettings from java code. This should be much more efficient as it avoids a lot of jni overhead and also allows for calling getLayoutWidth() etc multiple times without incurring a penalty. Reviewed By: lexs Differential Revision: D4077968 fbshipit-source-id: bce86ba610cd5ae36cfb45d78b2609c63a14cfa3