Use accessibility name of the bubble widget for ChromeVox.

ui/views/bubble/tray_bubble_view.cc

Index: ui/views/bubble/tray_bubble_view.cc
diff --git a/ui/views/bubble/tray_bubble_view.cc b/ui/views/bubble/tray_bubble_view.cc
index fb21a455ca8947ba7f8f06be84923aad52861780..284312231050fa7ac4440a1f7b6647c1e93e56a0 100644
--- a/ui/views/bubble/tray_bubble_view.cc
+++ b/ui/views/bubble/tray_bubble_view.cc
@@ -427,6 +427,10 @@ void TrayBubbleView::GetWidgetHitTestMask(gfx::Path* mask) const {
   mask->addRect(gfx::RectToSkRect(GetBubbleFrameView()->GetContentsBounds()));
 }
 
+base::string16 TrayBubbleView::GetAccessibleWindowTitle() const {
+  return delegate_->GetAccessibleNameForBubble();
+}
+
 gfx::Size TrayBubbleView::GetPreferredSize() const {
   return gfx::Size(preferred_width_, GetHeightForWidth(preferred_width_));
 }