arc: Make ChromeVox read an ARC custom notification

ui/arc/notification/arc_custom_notification_view.cc

Index: ui/arc/notification/arc_custom_notification_view.cc
diff --git a/ui/arc/notification/arc_custom_notification_view.cc b/ui/arc/notification/arc_custom_notification_view.cc
index 1ac5c335563036ba77a063cba44d3c203a145ae6..0ba780b50a7c859457c70328505834beba6dec8b 100644
--- a/ui/arc/notification/arc_custom_notification_view.cc
+++ b/ui/arc/notification/arc_custom_notification_view.cc
@@ -16,6 +16,7 @@
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/transform.h"
 #include "ui/message_center/message_center_style.h"
+#include "ui/message_center/views/custom_notification_view.h"
 #include "ui/resources/grit/ui_resources.h"
 #include "ui/strings/grit/ui_strings.h"
 #include "ui/views/background.h"
@@ -291,6 +292,12 @@ void ArcCustomNotificationView::AttachSurface() {
   slide_helper_.reset(new SlideHelper(this));
 }
 
+void ArcCustomNotificationView::UpdateAccessibleName() {
+  DCHECK(parent() != nullptr);
+  static_cast<message_center::CustomNotificationView *>(
+          parent())->set_accessible_name(item_->accessibile_name());
+}
+
 void ArcCustomNotificationView::ViewHierarchyChanged(
     const views::View::ViewHierarchyChangedDetails& details) {
   views::Widget* widget = GetWidget();
@@ -311,6 +318,7 @@ void ArcCustomNotificationView::ViewHierarchyChanged(
   if (!widget || !surface_ || !details.is_add)
     return;
 
+  UpdateAccessibleName();
   AttachSurface();
 }