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The previous algorithm would overcount small allocations that immediately follow
a very large allocation. See
https://bugs.chromium.org/p/chromium/issues/detail?id=810748#c6 for more
details.

The new algorithm samples small allocations as before, but now always records
large allocations.

Bug: 810748
Change-Id: Ic6f23db49825a07e9e7320addd9ff1d465d0a967
Reviewed-on: https://chromium-review.googlesource.com/919461
Commit-Queue: Erik Chen <erikchen@chromium.org>
Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536781}