tree 280209d46b22f715407b6ff1869425c297bbcfcb
parent 7e669a654e2fb4461e84de14d493ac221e1d739e
author Michael Bolin <mbolin@fb.com> 1383785185 -0800
committer Michael Bolin <mbolin@fb.com> 1384307551 -0800

Introduce ConditionalStep.

Summary: This is needed for the upcoming predex work.

Test Plan: Sandcastle builds.