tree f98a462722eb00a57b8b6e84191c83bd3cb3f51d
parent 3ee255f259541eff1251c8007f9135e8d664346a
author mtklein <mtklein@chromium.org> 1472644699 -0700
committer Commit bot <commit-bot@chromium.org> 1472644699 -0700

GN: add sources_when_disabled to optional

Also make sources_when_disabled and public_defines optional arguments.
These are the two mechanisms code uses to turn itself off...
probably at most one is ever used per optional.

Update fiddle to not crash when there's no PDF backend.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2292343003

Review-Url: https://codereview.chromium.org/2292343003