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Emit small memory metrics in the 1KB - 500MB range

Allow individual buckets for recording the 1-10KB range of small memory
metrics. For some metrics like
Memory.Experimental.Gpu2.Small.ServiceDiscardableManager the 0-10KB
bucket captures 88% of samples.

This change affects all Memory.Experimental.*.Small.* metrics.

Change-Id: I47faf6060f82642ea20438e57e9563d01e6e949e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940450Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Sasha McIntosh <sashamcintosh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#725988}