Add a field for dimensions that only apply to task queries

Things like qs_account and priority will be added to this.

BUG=chromium:1078826
TEST=./gen

Change-Id: I1d49c72050be8f86da36eadb88fe4525336a23d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2190910
Tested-by: Dhanya Ganesh <dhanyaganesh@chromium.org>
Auto-Submit: Dhanya Ganesh <dhanyaganesh@chromium.org>
Reviewed-by: George Engelbrecht <engeg@google.com>
Commit-Queue: George Engelbrecht <engeg@google.com>
2 files changed