Show content document for <fencedframe> element
Show content document for <fencedframe> element

Backend change in https://crrev.com/c/3214370.

Change-Id: Id470f27a4f167d6e86b134c77925d31fed2ac48a
Bug: 1261923
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3226727
Reviewed-by: Alex Rudenko <d8d88e7d7e77f69e23d1d1432231196fb8e02a62@chromium.org>
Commit-Queue: Adithya Srinivasan <5d2a45e7505d0f3e0a9674785f43c19bda77f687@chromium.org>

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