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This is needed as a first step to preserve grouping information for text
nodes within an SVG. Grouping information will help Select-to-Speak
properly re-order text nodes within an SVG to match a natural reading
order.

AX-Relnotes: n/a

R=dmazzoni@chromium.org

Bug: 892822
Change-Id: I29ad9db045df95fef0acb1a5bab5aa9337911211
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352614Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Joel Riley <joelriley@google.com>
Cr-Commit-Position: refs/heads/master@{#798357}