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Logs a deprecation warning to the console if the .type value is set
for any given entry, but otherwise defers to Dawn for all disambiguation
between the old and new syntax and related errors.

Bug: 1165629
Change-Id: I547b622f3634e6a7e7fa26c51d4462ea840fb8fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625810
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842857}