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send api::automation::EVENT_TYPE_ARIAATTRIBUTECHANGED when
ui::AXEventGenerator::Event::DESCRIPTION_CHANGED is sent to send
description changed event when state description is changed.
DESCRIPTION_CHANGED is disabled in CL:1073926, because state changes were noisy, but it should be safe to send DESCRIPTION_CHANGED.

Bug: b:154433831
Test: manual
Change-Id: I34f540a443eb58ff2978bdc17491c3117826afbe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2255737Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Saho Kobayashi <sahok@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781661}