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InspectorDOMAgent populates a field for ShadowRootTypes for nodes, but
InspectorDOMSnapshotAgent does not. This change exposes
InspectorDOMAgent's method for identifying the relevant type so that
InspectorDOMSnapshotAgent can populate its output analogously.

R=dgozman@chromium.org

Change-Id: Ida6f2d2bb370925dfdb301619258db275b8c5129
Reviewed-on: https://chromium-review.googlesource.com/932648Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Jandro Alderman <aalderman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539334}