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This CL adds the script and the target needed to extract Lacros binary /
resource size histogram JSON files, which are needed for size monitoring
on Chrome Performance Dashboard.

Following the methodology of how Android Chrome creates resource size
histograms (in //build/android), the key parts are:
* Target "resource_sizes_lacros_chrome" to create wrapper script in
  $OUT_DIR/bin for the main script. This will be called by build bots
  (hook to be added in follow-up).
* lacros_resource_sizes.py to read Lacros build artifact sizes, and to
  export the result to histogram JSON files.

lacros_resource_sizes.py is specialized for Lacros to simplify code. The
script accounts for each file in the ZIP file created by the
chromeos-amd64-generic-lacros-rel builder, but files can be aggregated
by a list and/or by directories. Changes in ZIP file content will require
updates to lacros_resource_sizes.py for proper size accounting.

Bug: 1106626
Change-Id: I9e42eeb2d54105b47fe37730ba098256bd67de54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346910Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798187}