This will be needed by Dawn to handle overriding pipeline constants by
name in the API.
Bug: tint:755
Change-Id: I857d8ef086b1964dac8d5cfff5c78d794234e8a8
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/50843
Commit-Queue: James Price <jrprice@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Ryan Harrison <rharrison@chromium.org>