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This is primarily to address the case of "inf / inf", which in terms of
doubles is 1, but in terms of TimeDeltas is a checkfailure.

Bug: 1148774
Change-Id: Iee4d80a721915ab2251535585153d9f6e2eb7f33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2545026Reviewed-by: Kevin Ellis <kevers@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828863}