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Compile Paint Previews on official builds. This has already been
compiled/tested on trybots/waterfall for a long time so shouldn't cause
any issues. The goal is to get this code shipping so we can start some
experiments.

Binary-Size: Regression is known about and approved by agrieve@.
Bug: 1035118
Change-Id: I9ff9f053cf0149e2aa68eeea9e052eb5edd1293c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067282Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743303}