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This CL modifies lacros_resource_sizes.py to identify ELF files, and
also track their stripped sizes (using eu-strip) as well as compressed
stripped sizes. These news info are recorded for chrome and the Total.

If eu-strip fails for a file then we simply ignore its stripping
results and print warning. Known-bad files include .nexe files and
libwidevinecdm.so. These are explicitly excluded to denoise the system.

Bug: 1106626
Change-Id: I9cb47bb41baa2b73996e6662db2fe4bc537338d7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2458869
Commit-Queue: Samuel Huang <huangs@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814972}