Get gn analyze to respect changes to vs_toolchain.py

When changing the default compiler toolchain, either when changing
_GetDesiredVsToolchainHashes() or CURRENT_DEFAULT_TOOLCHAIN_VERSION,
it is important that gn analyze knows that this means that everything
needs rebuilding. This avoids having to use the blunt-hammer of
landmines.

R=dpranke@chromium.org
BUG=683729,555273

Review-Url: https://codereview.chromium.org/2780023002
Cr-Original-Commit-Position: refs/heads/master@{#460887}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b62c0d449adee39905c8e0b7cd262f22502ae67a
1 file changed
tree: bc37abc1f17a01497f23cfbb2760df36d456b400
  1. tools/