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We introduced two new accessibility attributes for image
annotations. When these attributes change, it's exposed to
assistive technology as part of the accessible name,
so we need to fire name changed events to guarantee that
AT is updated.

Bug: 905419

Change-Id: I63d64b895ccbfc3265f037de3227be3da4dc41dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504705
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638310}