Scripts to get package size information

Adds some scripts to get the size contributions for individual
packages in the final system image.

  ./package_dependency_list.sh
    Takes a package, and determines all of its dependencies.
    Then gets the size of those dependencies using qsize and
    outputs the sum.
  ./package_dependency_runtime_stats.sh
    Builds the given package and its runtime dependencies and
    installs them to a temporary directory.  Then returns the
    final size used by those packages.

BUG=chromium:327527
TEST=`./package_size_stats.sh --board=beaglebone \
     /build/beaglebone` works
TEST=`./package_dependency_list.sh --board=beaglebone \
     update_engine` works
TEST=`./package_dependency_runtime_stats.sh --board=beaglebone \
     gflags` works

Change-Id: I5a99980567e0cb1cfa2bbbc009a167b4f6392ccf
Reviewed-on: https://chromium-review.googlesource.com/182393
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Steve Fung <stevefung@chromium.org>
Commit-Queue: Steve Fung <stevefung@chromium.org>
Tested-by: Steve Fung <stevefung@chromium.org>
3 files changed