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This is a reland of aa42f61e

Original change's description:
> CDP: make a11y info optional
>
> This CL adds an attribute to the highlight config object to control
> whether a11y info should be shown. The test expectations have been
> updated accordingly. There is an accompanying CL in DevTools which makes
> use of the new attribute[1].
>
> [1] https://crrev.com/c/2238230
>
> Bug: 1092841
> Change-Id: Ic4a888ecf134b852fd67430b924da3812f244dac
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2238828
> Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>
> Reviewed-by: Peter Marshall <petermarshall@chromium.org>
> Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#778791}

Bug: 1092841
TBR: caseq@chromium.org
Change-Id: I9b14d446efe6355af0e8a8f43dcf1f866783a216
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248680Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Alex Rudenko <alexrudenko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779322}