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Adds a configurable GN flag |lock-to-version| to set the main plist
CFBundleVersion to a constant MAJOR.MINOR.BUILD value and a variable
'MAJORPATCH' in the normal PATCH tuple.

Bug: 1140474
Change-Id: I570a6502a438c60a5bd3822c60072ab5fd677ba3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485679
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818974}