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

chrome/browser/ui/views/website_settings/permissions_bubble_view.cc

Index: chrome/browser/ui/views/website_settings/permissions_bubble_view.cc
diff --git a/chrome/browser/ui/views/website_settings/permissions_bubble_view.cc b/chrome/browser/ui/views/website_settings/permissions_bubble_view.cc
index 3a77f05da2c3e0360ea0e9c1cc7d07ed39c0805a..b950ea763145f3624e7f9f19d8ad85b2d3b77db4 100644
--- a/chrome/browser/ui/views/website_settings/permissions_bubble_view.cc
+++ b/chrome/browser/ui/views/website_settings/permissions_bubble_view.cc
@@ -167,6 +167,7 @@ class PermissionsBubbleDelegateView : public views::BubbleDelegateView,
   const gfx::FontList& GetTitleFontList() const override;
   base::string16 GetWindowTitle() const override;
   void OnWidgetDestroying(views::Widget* widget) override;
+  void GetAccessibleState(ui::AXViewState* state) override;
 
   // ButtonListener:
   void ButtonPressed(views::Button* button, const ui::Event& event) override;
@@ -351,6 +352,11 @@ void PermissionsBubbleDelegateView::OnWidgetDestroying(views::Widget* widget) {
   }
 }
 
+void PermissionsBubbleDelegateView::GetAccessibleState(ui::AXViewState* state) {
+  views::BubbleDelegateView::GetAccessibleState(state);
+  state->role = ui::AX_ROLE_ALERT_DIALOG;

[msw, 2015/04/06 23:01:20]

Why can't this use ui::AX_ROLE_DIALOG like other bubbles?

[David Tseng, 2015/04/06 23:34:02]

See my other comments. 

+}
+
 void PermissionsBubbleDelegateView::ButtonPressed(views::Button* button,
                                                   const ui::Event& event) {
   if (!owner_)