Fire an alert event to notify accessibility when a permissions bubble gets shown.

ui/views/bubble/bubble_delegate.cc

Index: ui/views/bubble/bubble_delegate.cc
diff --git a/ui/views/bubble/bubble_delegate.cc b/ui/views/bubble/bubble_delegate.cc
index 55ce980289149c322219d60e35222009d4ee8614..1dd8817a0e1038ad67ed1aaee8c406b6a36b5ef6 100644
--- a/ui/views/bubble/bubble_delegate.cc
+++ b/ui/views/bubble/bubble_delegate.cc
@@ -300,11 +300,15 @@ void BubbleDelegateView::UpdateColorsFromTheme(const ui::NativeTheme* theme) {
 void BubbleDelegateView::HandleVisibilityChanged(Widget* widget, bool visible) {
   if (widget == GetWidget() && anchor_widget() &&
       anchor_widget()->GetTopLevelWidget()) {
-    if (visible)
+    if (visible) {

[msw, 2015/04/06 17:57:20]

nit: you don't need to add these curly braces anymore.

[David Tseng, 2015/04/06 18:03:32]

Done.

       anchor_widget()->GetTopLevelWidget()->DisableInactiveRendering();
-    else
+    } else {
       anchor_widget()->GetTopLevelWidget()->EnableInactiveRendering();
+    }
   }
+
+  if (widget == GetWidget() && visible)
+    NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 }
 
 }  // namespace views