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Proper fix for process-graph.py (changes were reverted in
https://crrev.com/c/2266652).

Bug: chromium:941669
Change-Id: I38242be26371246a33a88630a1480ce8446b7680
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2267737
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Hans Wennborg <hans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783094}