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This change will forward the build arg to iOS test runner scripts. CL
changing how test runner scripts are consuming this arg is at
crrev/c/2092941.

Bug: 943883
Change-Id: I4f52cf5fcc83cdca75570c812fd1c0629a96f4ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2099479Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749729}