Have VoiceOver play a sound when a download changes state.

Safari plays a sound when a download fails. This does it for both
success and failure.

Bug: 787139
Change-Id: If3df9aaed218f8b66fcf124ae8f2529eba87c6f5
Reviewed-on: https://chromium-review.googlesource.com/850743Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#527113}

chrome/browser/ui/cocoa/download/download_item_controller.mm

@@ -30,6 +30,7 @@
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/page_navigator.h"
 #include "third_party/google_toolbox_for_mac/src/AppKit/GTMUILocalizerAndLayoutTweaker.h"
+#include "ui/base/cocoa/a11y_util.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/font.h"
@@ -228,6 +229,10 @@ class DownloadShelfContextMenuMac : public DownloadShelfContextMenu {
 
 - (void)setStateFromDownload:(DownloadItemModel*)downloadModel {
   DCHECK_EQ([self download], downloadModel->download());
+
+  if (downloadModel->download()->GetState() != DownloadItem::IN_PROGRESS)
+    ui::a11y_util::PlayElementUpdatedSound(self.view.window);
+
   if (base::FeatureList::IsEnabled(features::kMacMaterialDesignDownloadShelf)) {
     [progressView_ setStateFromDownload:downloadModel];
     CGFloat preferredWidth = progressView_.preferredWidth;

ui/base/cocoa/a11y_util.h

@@ -17,6 +17,11 @@ namespace a11y_util {
 // voice over (i.e., an icon next to a written description of the icon).
 UI_BASE_EXPORT void HideImageFromAccessibilityOrder(NSImageView* view);
 
+// Ask VoiceOver to play a sound for |object|, generally a view or window
+// (undocumented). Built-in apps seem to use this to indicate that something
+// interesting has happened, like a failed download or available completions.
+UI_BASE_EXPORT void PlayElementUpdatedSound(id source);
+
 }  // namespace a11y_util
 }  // namespace ui
 

ui/base/cocoa/a11y_util.mm

@@ -15,5 +15,11 @@ void HideImageFromAccessibilityOrder(NSImageView* view) {
                                 forAttribute:NSAccessibilityRoleAttribute];
 }
 
+void PlayElementUpdatedSound(id source) {
+  NSAccessibilityPostNotificationWithUserInfo(
+      source, @"AXPlaySound",
+      @{@"AXSoundIdentifier" : @"AXElementUpdatedSound"});
+}
+
 }  // namespace a11y_util
 }  // namespace ui