a11y: Increase time between progress announcements for non-focused downloads

Bug: 839694
Change-Id: Iccea0d36e83733d285a1222bdf1ebb669d7f3104
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2569969Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833344}

chrome/browser/ui/views/download/download_item_view.cc

@@ -246,7 +246,7 @@ DownloadItemView::DownloadItemView(DownloadUIModel::DownloadUIModelPtr model,
       accessible_alert_(accessible_alert),
       accessible_alert_timer_(
           FROM_HERE,
-          base::TimeDelta::FromSeconds(30),
+          base::TimeDelta::FromMinutes(3),
           base::BindRepeating(&DownloadItemView::AnnounceAccessibleAlert,
                               base::Unretained(this))) {
   views::InstallRectHighlightPathGenerator(this);