Retain popup bubble mouse status even through updates.

ui/message_center/views/toast_contents_view.cc

Index: ui/message_center/views/toast_contents_view.cc
diff --git a/ui/message_center/views/toast_contents_view.cc b/ui/message_center/views/toast_contents_view.cc
index 690e694156827f658ab2c4a5ae7a4b3be0b4574e..d004e57f2ad3de379b7592496982efb3c1e1b4a6 100644
--- a/ui/message_center/views/toast_contents_view.cc
+++ b/ui/message_center/views/toast_contents_view.cc
@@ -87,6 +87,15 @@ void ToastContentsView::SetContents(MessageView* view,
     NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, false);
 }
 
+void ToastContentsView::UpdateContents(const Notification& notification,
+                                       bool a11y_feedback_for_updates) {
+  DCHECK_GT(child_count(), 0);
+  MessageView* message_view = static_cast<MessageView*>(child_at(0));
+  message_view->UpdateWithNotification(notification);
+  if (a11y_feedback_for_updates)
+    NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, false);
+}
+
 void ToastContentsView::RevealWithAnimation(gfx::Point origin) {
   // Place/move the toast widgets. Currently it stacks the widgets from the
   // right-bottom of the work area.