a11y/Mac: Add screenreader support for SubtleNotificationView announcements.

chrome/browser/ui/views/exclusive_access_bubble_views.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 "chrome/browser/ui/views/exclusive_access_bubble_views.h"
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/macros.h"
@@ skipping 107 matching lines @@
   view_->SetSize(size);
   popup_->SetBounds(GetPopupRect(false));
   Show();
 
   // Stop watching the mouse even if UpdateMouseWatcher() will start watching
   // it again so that the popup with the new content is visible for at least
   // |kInitialDelayMs|.
   StopWatchingMouse();
 
   UpdateMouseWatcher();
+
+  view_->NotifyAccessibilityEvent(ui::AX_EVENT_TEXT_CHANGED, true);
 }
 
 void ExclusiveAccessBubbleViews::RepositionIfVisible() {
   if (popup_->IsVisible())
     UpdateBounds();
 }
 
 views::View* ExclusiveAccessBubbleViews::GetView() {
   return view_;
 }
@@ skipping 112 matching lines @@
 }
 
 void ExclusiveAccessBubbleViews::Hide() {
   animation_->SetSlideDuration(kSlideOutDurationMs);
   animation_->Hide();
 }
 
 void ExclusiveAccessBubbleViews::Show() {
   animation_->SetSlideDuration(kSlideInDurationMs);
   animation_->Show();
+
+  view_->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 }
 
 bool ExclusiveAccessBubbleViews::IsAnimating() {
   return animation_->is_animating();
 }
 
 bool ExclusiveAccessBubbleViews::CanMouseTriggerSlideIn() const {
   return !bubble_view_context_->IsImmersiveModeEnabled();
 }
 
 void ExclusiveAccessBubbleViews::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
   DCHECK_EQ(chrome::NOTIFICATION_FULLSCREEN_CHANGED, type);
   UpdateMouseWatcher();
 }
 
 void ExclusiveAccessBubbleViews::OnWidgetVisibilityChanged(
     views::Widget* widget,
     bool visible) {
   UpdateMouseWatcher();
 }
 
 void ExclusiveAccessBubbleViews::LinkClicked(views::Link* link,
                                              int event_flags) {
   ExitExclusiveAccess();
 }