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With this change, the script executor follows
AssistantActionProto.action_delay_ms, when it is set.

Bug: 806868
Change-Id: I4cb7ba2074f316cb27bffb61f9f14dc200639792
Reviewed-on: https://chromium-review.googlesource.com/1186737
Commit-Queue: Ganggui Tang <gogerald@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585922}