re-land of skslc now automatically turns on derivatives support

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=3602

Change-Id: I822fc23f7d4eac76d5059412706117818f3738f0
Reviewed-on: https://skia-review.googlesource.com/3602
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
17 files changed