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Also change to use mixin for existing bots.


Bug: 967011,961808
Change-Id: I68334b0c223a12ee0e0db48a86256ff20fbe0058
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1649057Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Yun Liu <yliuyliu@google.com>
Cr-Commit-Position: refs/heads/master@{#667262}