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Delegated ink trails should only ever been drawn on the root render
pass as all of their points are transformed to be in the root
coordinate space and they are drawn on top of everything. Therefore,
make sure that they are only drawn on the root render pass.

Bug: 1144354
Change-Id: Ic954e7d9b93895b493c03a89d4fab4e3711b1ca1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2511757Reviewed-by: weiliangc <weiliangc@chromium.org>
Reviewed-by: Daniel Libby <dlibby@microsoft.com>
Commit-Queue: Mario Bianucci <mabian@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#823572}