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Also changed IntegerSum from two operands to N operands. Not sure why it
wasn't set up like that in the first place.

Bug: b/145043394
Change-Id: I81bf164b7fd10e76c0741889b479f04061fd5e87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130552
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Marian Fechete <marianfe@google.com>
Cr-Commit-Position: refs/heads/master@{#755368}