app_list: Fix accessibility regression in apps grid.

ui/app_list/apps_grid_view.cc

Index: ui/app_list/apps_grid_view.cc
diff --git a/ui/app_list/apps_grid_view.cc b/ui/app_list/apps_grid_view.cc
index dec5a53ad98690779776cc73cd3830b6f20bcfa9..a5c9b727e1f1af30e5ade7092a89971d9b8975bd 100644
--- a/ui/app_list/apps_grid_view.cc
+++ b/ui/app_list/apps_grid_view.cc
@@ -10,6 +10,7 @@
 #include "ui/app_list/pagination_model.h"
 #include "ui/base/events/event.h"
 #include "ui/views/border.h"
+#include "ui/views/widget/widget.h"
 
 namespace {
 
@@ -295,7 +296,10 @@ void AppsGridView::SetSelectedItemByIndex(int index) {
     selected_item_index_ = -1;
   } else {
     selected_item_index_ = index;
-    GetItemViewAtIndex(selected_item_index_)->SchedulePaint();
+    AppListItemView* selected_view = GetItemViewAtIndex(selected_item_index_);
+    selected_view->SchedulePaint();
+    GetWidget()->NotifyAccessibilityEvent(
+        selected_view, ui::AccessibilityTypes::EVENT_FOCUS, true);
 
     if (tiles_per_page()) {
       pagination_model_->SelectPage(selected_item_index_ / tiles_per_page(),