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The new feature controls the saving UI only so that we can:
a) experiment with filling and saving independently
b) guard highly experimental and testing-only saving surfaces initially

Bug: 1018700
Change-Id: I44f190dac515a42cdf2173b89e9fded3ba4b3983
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1926129Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716985}