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This change extends the on_top filter to allow controlling:
 - whether it should call scrollIntoViewIfNeeded
 - whether it should accept element that it cannot check,
   because they are outside of the viewport

Bug: b/171464034
Change-Id: Ifa7de037325a10ca4c5ed5fe45d962f5289e8c76
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2513646
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Sandro Maggi <sandromaggi@google.com>
Cr-Commit-Position: refs/heads/master@{#823982}