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When the feature is enabled: the 1st floc computation condition will
not only be first-sync-enabled-seen, but would also require
first-blocklist-loaded-seen, as both conditions are likely to occur
after a while after browser start. When floc is computed from history,
invalidate it if it's in the blocklist; invalidate any floc when the
blocklist is not yet loaded / has error in loading.


Bug: 1062736
Change-Id: I81dcfc27b0d2a7023ba1559d30131de41d5842ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2365396Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800295}