Add 'origin/googletest/' from commit '8ef491440fcaec96f899d73e08873426c78583a4'

This helps bootstrap the mergeinfo so future googletest imports can be
done more easily.

Suggested by: jrtc27
Fixes: 28f6c2f292806bf31230a959bc4b19d7081669a7

git-subtree-dir: origin/googletest
git-subtree-mainline: bcf81d7794a7b20425cdb48a580d977c49f75251
git-subtree-split: 8ef491440fcaec96f899d73e08873426c78583a4