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Some attributes such as ID, class name, relative bounds and visibility are automatically added by ViewAccessibility.
R=dmazzoni@chromium.org, sky@chromium.org

Change-Id: Ic27ec3f3d30e57f4e6ecd6ba2bb264650b20c887
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918682Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715828}