DevTools: Allow screen readers to announce audit status

This change marks that audit status text with role="status" which is an
ARIA live region so screen readers will announce status changes.

This meets the following WCAG success criteria
1.3.1 https://www.w3.org/WAI/WCAG21/quickref/#info-and-relationships
4.1.2 https://www.w3.org/WAI/WCAG21/quickref/#name-role-value
4.1.3 https://www.w3.org/WAI/WCAG21/quickref/#status-messages

Bug: 963183
Change-Id: Ib0cef967fc4c8b22029eba7fb664cb516ca299e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1701637
Commit-Queue: John Emau <johnemau@microsoft.com>
Reviewed-by: Joel Einbinder <einbinder@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#678918}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 24b0e9be9cd9f014cf747b7a6c72285ac98c462a
diff --git a/front_end/audits/AuditsStatusView.js b/front_end/audits/AuditsStatusView.js
index 0d025a1..3ebd460 100644
--- a/front_end/audits/AuditsStatusView.js
+++ b/front_end/audits/AuditsStatusView.js
@@ -55,6 +55,7 @@
     this._progressWrapper = fragment.$('progress-wrapper');
     this._progressBar = fragment.$('progress-bar');
     this._statusText = fragment.$('status-text');
+    UI.ARIAUtils.markAsStatus(this._statusText);
 
     this._dialog.setDefaultFocusedElement(cancelButton);
     this._dialog.setSizeBehavior(UI.GlassPane.SizeBehavior.SetExactWidthMaxHeight);