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Backings require re-implementing of traits. Split the files off instead
of relying on the macro to split the implementation of each trait.

Bug: 1056170
Change-Id: I43a005119986ec51c05a34f76dca25614a6f1196
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642340
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846189}