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This implements the logic for the paint preview capture experiment.
The experiment is behind a chrome flag that is disabled by default.
Experiment doc: http://go/fdt-sample-experiment

Bug: 1039810
Change-Id: I0b9db1ebe06d5b10da482ca1105c88d33afd1bc4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2044064Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743392}