message: cr-buildbucket.cfg: Add cache for win_toolchain
diff: @@ -91,6 +91,10 @@ buckets {
  name: "dawn"
  }
  service_account: "dawn-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
  + caches {
  + path: "win_toolchain"
  + name: "win_toolchain"
  + }
  }
  # Linux: test combinations of {clang}x{release,debug}x{x86,x64}
  @@ -198,6 +202,10 @@ buckets: {
  properties_j: "$depot_tools/bot_update:{\"apply_patch_on_gclient\":true}"
  }
  service_account: "dawn-try-builder@chops-service-accounts.iam.gserviceaccount.com"
  + caches {
  + path: "win_toolchain"
  + name: "win_toolchain"
  + }
  }
  # A subset of the CI configurations are used for the CQ. We still mirror
  