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The new script makes it easy to measure a set of archived .apks.
Add to resource_sizes.py the ability to output to stdout and fixes
up some warning messages it was showing.

Change-Id: I1e4ed41369280b7f7bb6a3282a000e7483f04569
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717267
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680711}