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This should make resource_sizes output files in a format and structure
amenable to process_perf_results.

Bug: 807273,861983
Change-Id: I5d359b35ad4ba836cd1282f804daf996fbbec7e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574455
Commit-Queue: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Auto-Submit: John Budorick <jbudorick@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652688}