[code coverage] Set up properties for coverage builders

Bug: 896751
Change-Id: Ic73a6f6f297864a4a197c30fffb0477b2d03c649
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1766761
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Yun Liu <yliuyliu@google.com>
Cr-Commit-Position: refs/heads/master@{#689766}
1 file changed