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This is a reland of d018c076

Original change's description:
> Reland: [Accessibility] Volume slider reads out level in percentages.
>
> This is a reland of change I0ee5a91215669f39c7394d3c8f113ae83a74cf00
>
> This CL makes it such that the volume level is read out as a percentage
> in aria. This CL also amplifies how the accessibility information is
> given to aria, by setting attributes instead of explicitly creating
> accessibility nodes.
>
> TBR=thakis@chromium.org
>
> Bug: 905024
> Change-Id: I831d9ed1f1790556d1a58431f3aaf9562c2c9043
> Reviewed-on: https://chromium-review.googlesource.com/c/1373032
> Reviewed-by: CJ DiMeglio <lethalantidote@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
> Commit-Queue: CJ DiMeglio <lethalantidote@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#617338}

TBR=thakis@chromium.org,dmazzoni@chromium.org,mlamouri@chromium.org

Bug: 905024
Change-Id: Ie308a4b30032491333072681fcf214a9fab58d5c
Reviewed-on: https://chromium-review.googlesource.com/c/1383307Reviewed-by: CJ DiMeglio <lethalantidote@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: CJ DiMeglio <lethalantidote@chromium.org>
Cr-Commit-Position: refs/heads/master@{#618940}