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Android arm64 builds of monochrome need to build multiple apks with
various combinations of 32-vs-64-bit chrome & webview. Each apk will
need a unique version code, distinguished by the second-to-last digit
(the architecture digit).

This CL modifies the version code logic to support this.

Bug: 946281
Test: Check chrome_versions.txt, add automated tests.
Change-Id: I78b8d6fedb4c18db2442f50a027f988616e180c8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1540683
Commit-Queue: Drew Stonebraker <stonebraker@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Christopher Grant <cjgrant@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646640}