app_list: Fix accessibility regression in apps grid.

ui/app_list/apps_grid_view.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/app_list/apps_grid_view.h"
 
 #include <algorithm>
 
 #include "ui/app_list/app_list_item_view.h"
 #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 {
 
 // Padding space in pixels for fixed layout.
 const int kLeftRightPadding = 20;
 const int kTopPadding = 1;
 
 // Padding space in pixels between pages.
 const int kPagePadding = 40;
 
@@ skipping 265 matching lines @@
   if (selected_item_index_ == index)
     return;
 
   if (selected_item_index_ >= 0)
     GetItemViewAtIndex(selected_item_index_)->SchedulePaint();
 
   if (index < 0 || index >= child_count()) {
     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(),
                                     true /* animate */);
     }
   }
 }
 
 void AppsGridView::ListItemsAdded(size_t start, size_t count) {
   for (size_t i = start; i < start + count; ++i)
@@ skipping 24 matching lines @@
 
 void AppsGridView::SelectedPageChanged(int old_selected, int new_selected) {
   Layout();
 }
 
 void AppsGridView::TransitionChanged() {
   Layout();
 }
 
 }  // namespace app_list