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The variable here is an `int64_t`. On arm, this should be `%lld`. PRId64
solves these things.

Bug: 1058218
Change-Id: Id06c379bd3af9498ea8b5e0fb94c2c594d4be1d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095942Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: George Burgess <gbiv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748793}