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This change mostly contains build script change under //chrome/build only.
It is targeting MSVC arm64 toolset, but enable clang-cl
could be based on this change.

Bug: 893460
Change-Id: Ia6f69f067a97fcaeb77021c1019bc594b0859eda
Reviewed-on: https://chromium-review.googlesource.com/c/1272076
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Steven Valdez <svaldez@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600083}