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|time_delta| can be a rather large microsecond value, multiplying
with |process_cpu_time_delta| can cause uint64 overflow.

Instead, compute a double factor from time_delta/total_delta first.

Bug: 1129004
Change-Id: I8ff9fd6a03551d1bdde29d263f76b1f5857ed3be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424192Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Auto-Submit: Eric Seckler <eseckler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809775}