"Revert "skia: Rename perf flag" again"
	I only needed this to test setting var in build repo.
	It is better to try to keep all equal for mgrep etc.
This reverts commit 1c56efbeb0a91f05599b6cd366c78f7889c402ea.

Change-Id: I4069ecb0e096bb66593b26f0ef04acd39fa544be