Ben Clayton 12d54d746e transform: Make methods const, add ShouldRun()
Transforms are supposed to be immutable, operating on the DataMaps provided for input and output, so make the methods const.

Add a ShouldRun() method which the Manager can use to skip over transforms that do not need to be run.

Change-Id: I320ac964577e94ac988748d8aca85bd43ee8d3b5
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/77120
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
2022-01-25 20:53:25 +00:00
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