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This allows findAncestor() to continue when it reaches a shadow boundary.

Bug: 355446
Change-Id: I2588b04b545572535bb2a58450a3cca7b65454c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1963137
Commit-Queue: Dan Beam <dbeam@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Auto-Submit: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#724101}