Use AtomicOutput for java_cpp_enum.py

AtomicOutput does not update file timestamp, and it prevents to invoke additional build steps when the file content is not changed.

Bug: 810298
Change-Id: I4308ffb0c53325f3e4375ef85e7a8a302a8aac7b
Reviewed-on: https://chromium-review.googlesource.com/1124126
Commit-Queue: agrieve <agrieve@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572191}
1 file changed