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This is a modified reland of [1] with most of the changes to sizes.py reverted.
Those changes are still used by the perf dashboard so must be kept around for
the time being.

[1] https://chromium.googlesource.com/chromium/src.git/+/5f552b39961e3b36e018fdd7d3d452526bde2e4f

R=dpranke
Bug: 572393
Cq-Include-Trybots: luci.chromium.try:linux_chromium_archive_rel_ng;luci.chromium.try:mac_chromium_archive_rel_ng;luci.chromium.try:win_archive;luci.chromium.try:win_x64_archive;master.tryserver.chromium.android:android_archive_rel_ng

Change-Id: I459387d50f4a328192110c7b75983523a14f787d
Reviewed-on: https://chromium-review.googlesource.com/c/1255303
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597614}