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This is a reland of 2000b5b1

Got reverted because of MSAN failure didn't run the msan bot one last time before
submitting yesterday after I changed some things to use skip-viewport-activation, oops.
The MSAN failure is because we never initialize the enum ax::mojom::NameFrom  in
InspectorAccessibilityAgent::FillCoreProperties when the ax object is a display:none node
within a locked subtree, so I set a default value for it, and it doesn't fail now!

Original change's description:
> DL: Fix flaky getFullAXTree & wrongly updated accessibility tests
>
> A devtoools display locking a11y test was marked as failing in MSAN bots
> and is also flaky when tested locally, this CL updates that test and
> fixes the cause of the failure (getFullAXTree might be called when
> style/layout is dirty, which caused failing DCHECKs).
>
> Some other display locking a11y tests were not updated correctly, and is
> updated in this CL as well.
>
> Bug: 996625
> Change-Id: I32eac1385c54eb07b1e6dab800620a2485158437
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1846618
> Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
> Reviewed-by: vmpstr <vmpstr@chromium.org>
> Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#706834}

Bug: 996625
Change-Id: I168e40614ab600d1bd11f5cf97c166fa95400213
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866338Reviewed-by: Alice Boxhall <aboxhall@chromium.org>
Reviewed-by: vmpstr <vmpstr@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708131}