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Third parties would construct toolchain packages on their own,
with the best of their abilities, based on the instructions
provided.

They could then accumulate <canonical hash> -> <their own hash> pairs
in their environment to support historical builds.

Example mapping:
set GYP_MSVS_HASH_1180cb75833ea365097e279efb2d5d7a42dee4b0=4181fce548fece344a85cb6898cf996692998531

Bug: 836225
Change-Id: I4a46e51b09049340344c9717481b141a2a7c296b
Reviewed-on: https://chromium-review.googlesource.com/1025896Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Kimmo Kinnunen FI <kkinnunen@nvidia.com>
Cr-Commit-Position: refs/heads/master@{#553476}