Keep track of fixed positioning in accessibility tree.

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

Index: third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp b/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
index 156fd55d739918a4460619516149fa7d3d802338..cf627c64b5900f57f2fbce0de38eb86797371f79 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXMenuListOption.cpp
@@ -155,10 +155,10 @@ bool AXMenuListOption::ComputeAccessibilityIsIgnored(
   return AccessibilityIsIgnoredByDefault(ignored_reasons);
 }
 
-void AXMenuListOption::GetRelativeBounds(
-    AXObject** out_container,
-    FloatRect& out_bounds_in_container,
-    SkMatrix44& out_container_transform) const {
+void AXMenuListOption::GetRelativeBounds(AXObject** out_container,
+                                         FloatRect& out_bounds_in_container,
+                                         SkMatrix44& out_container_transform,
+                                         bool& out_is_fixed_positioned) const {
   *out_container = nullptr;
   out_bounds_in_container = FloatRect();
   out_container_transform.setIdentity();
@@ -173,7 +173,8 @@ void AXMenuListOption::GetRelativeBounds(
     return;
   DCHECK(grandparent->IsMenuList());
   grandparent->GetRelativeBounds(out_container, out_bounds_in_container,
-                                 out_container_transform);
+                                 out_container_transform,
+                                 out_is_fixed_positioned);
 }
 
 String AXMenuListOption::TextAlternative(bool recursive,