Correctly fire active descendant changes for more roles

third_party/WebKit/Source/modules/accessibility/AXObject.cpp

Index: third_party/WebKit/Source/modules/accessibility/AXObject.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXObject.cpp b/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
index 5beffc588679ecf5ab2b14538b84f9e3517356c6..1c9a1cdb15ca78e9789aa8b8674652f1e554c5c0 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXObject.cpp
@@ -1017,13 +1017,14 @@ bool AXObject::supportsActiveDescendant() const
     // According to the ARIA Spec, all ARIA composite widgets, ARIA text boxes
     // and ARIA groups should be able to expose an active descendant.
     // Implicitly, <input> and <textarea> elements should also have this ability.
-    switch (ariaRoleAttribute()) {
+    switch (roleValue()) {
     case ComboBoxRole:
     case GridRole:
     case GroupRole:
     case ListBoxRole:
     case MenuRole:
     case MenuBarRole:
+    case PopUpButtonRole:
     case RadioGroupRole:
     case RowRole:
     case SearchBoxRole: