Adding android opt bot to the default trybot list.
Adding android opt bot to the default trybot list.

BUG=None
TEST=None
R=jfb@chromium.org, sehr@chromium.org

Review URL: https://codereview.chromium.org/945453002

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client