AAPT: Fix issue with synthesized resource not actually showing up

AAPT keeps around a few pieces of state that are disjoint, so
simply adding to a collection won't add the resource to the final
flattened output. Instead, we create the resource from the top
and then copy over the values into the newly created resource.

Bug:17647890
Change-Id: I214263e84c18f9370c6e6a5aa53aa2d833fc842d