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AtomicOutput does not update file timestamp, and it prevents to invoke additional build steps when the file content is not changed.
This will be affective for some jar related actions. (e.g. mojo/protobuf generator for java)

Bug: 810298
Change-Id: If7b5dd4405214164818b18e49642fb29147667c8
Reviewed-on: https://chromium-review.googlesource.com/1123970Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572194}