Keep track of fixed positioning in accessibility tree.

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

Index: third_party/WebKit/Source/modules/accessibility/AXImageMapLink.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXImageMapLink.cpp b/third_party/WebKit/Source/modules/accessibility/AXImageMapLink.cpp
index b8bca55ac8655527c38485892b6eb95236cead4a..26e0d02a481e5c40e06e387f7f6bea12bf657cc5 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXImageMapLink.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXImageMapLink.cpp
@@ -97,10 +97,10 @@ KURL AXImageMapLink::Url() const {
   return AreaElement()->Href();
 }
 
-void AXImageMapLink::GetRelativeBounds(
-    AXObject** out_container,
-    FloatRect& out_bounds_in_container,
-    SkMatrix44& out_container_transform) const {
+void AXImageMapLink::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();