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The previous code worked for .apk files created by our build
system (where Python performs alignment), but did not work
for .apk files that are aligned using Android's zipalign tool
(as is the case for bundles).

Also changes zipalign overhead to be stored in metadata
rather than as a symbol so that the supersize symbols sum
matches normalized apk size.

Bug: 1130754
Change-Id: Ia852ec1efec4e7a13faa5072cd67cd204148c8b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423409
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809515}