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Added the property to iOS CI and try builder definitions. Recipe side
change consuming the properties: crrev/c/2161434

Bug: 1072033
Change-Id: Id14eee275d92b4620156a99ec2d764767f204544
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2161624
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762089}