[Android] Add workaround to update verification script for Mac.
[Android] Add workaround to update verification script for Mac.

It seems like the aapt binary which pylib uses to get the package
name from an apk doesn't run on Macs. Adding an argument to the
script to be able to manually specify the package name so Mac users
can use this script.

BUG=

Review URL: https://codereview.chromium.org/1143073006

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#331222}

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