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Take into account that in Shadow DOM v1 document-fragment elements are reported
in an Event's path.

Bug: 897168
Change-Id: I95d16b46ec2b66244b03f5b9aec98d0ca6dc7abc
Reviewed-on: https://chromium-review.googlesource.com/c/1294422Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601762}