Update layoutlib following platform change in VectorDrawable

Commit 028029730b copies tree properties when mutating a vector
drawable. Layoutlib does the same.

Bug: 28974071
Change-Id: I5075b35e517df4ce32a91e2926d9caa02a0c2606
(cherry picked from commit 5ee73b3466090828acdc87fffd95247b6ace6440)
1 file changed