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This tool allows users to sanity check what histograms will be
generated by patterned histograms or histogram suffixes. The difference
between this tool and the print_histogram_names.py is that this tool
also allows you to see what the generated summary and expanded owners.

Bug: 1143748
Change-Id: I55bf2d3c127ecf6292bac08661ede2045a4eaaae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533320
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Auto-Submit: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826608}