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After this CL coverage data from tests in these builders will surface
in Gerrit. Changed try builders configs and test configs to enable it on
the 2 iOS CQ builders.

In order to pass CQ, this change includes builder and test configs. GN
config change is in crrev/c/2566333 and will be landed right after.

Bug: 1090188
Change-Id: Ia4ddb14633c24b7a0de1f2f85643b3fa0590291c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547921
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832413}