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If a change is made to the custom data or file structure there will
currently be a failure to composite. This failure will be recorded as
a generic deserialization failure. This CL provides a version number
recorded in the proto to allow compositing failures due to version
differences to be recorded independently.

This CL also deletes the paint preview if there was an issue starting
the compositor to avoid replicating the issue.

Bug: 1122015
Change-Id: I7b63a6491b497f78ec59852f0fc50996503e9f06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2377109
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801878}