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This function returns the current TimeDelta, snapped to the nearest
multiple of |interval| by the appropriate method.  This will be useful
for a variety of current callers of / and %.

Bug: 1104532
Change-Id: I3add5b875961938e7620e12b86127c508412c68d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343509
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797928}