MacPWAs: Add major and minor shim versions to Info.plist

This is already implicitly in the app shim in that it's embedded into
the binary. This will help to identify ancient shims versus up-to-date
shims.

Bug: 929559
Change-Id: I948a76e5ca9e14829218c2ce2388063337542cca
Reviewed-on: https://chromium-review.googlesource.com/c/1466146
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631835}
3 files changed