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If //build/vs_toolchain.py is changed (or any file it imports,
including gn_helpers.py), we should bypass `analyze` on the
trybots because we may need to rebuild everything.

(Technically, we only need to do this on Win hosts, but we don't
have a good way of filtering that at the moment).

This is needed when updating the VS toolchain, including SDK updates.
This change makes it so that a full build will be requested. The
build will be a NOP unless the toolchain has actually changed, in which
case the changed command lines will make all of the compile commands
dirty.

Bug: 842111
Change-Id: I2222798c7c8fd691383a0eca1414d1e8afdb55f8
Reviewed-on: https://chromium-review.googlesource.com/1055869Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558342}