GitLab

Reland "InspectorDOMSnapshotAgent: expose and book layout nodes owned by pseudo elements under their owners."

This is a reland of 513a9fad

Original change's description:
> InspectorDOMSnapshotAgent: expose and book layout nodes owned by pseudo elements under their owners.
> 
> Currently, only support before, after and first letter pseudo types.
> 
> Change-Id: Ifb10fecad1dbfb6b987eaa0bd0e7ccb4a222d13f
> Reviewed-on: https://chromium-review.googlesource.com/1125511
> Commit-Queue: Hidy Han <hidyhan@chromium.org>
> Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#575785}

Change-Id: I2117929001edc511d11f2d5386e90327ff1a666d
Reviewed-on: https://chromium-review.googlesource.com/1157305Reviewed-by: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Hidy Han <hidyhan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580369}