Keep track of fixed positioning in accessibility tree.

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

Index: third_party/WebKit/Source/modules/accessibility/AXImageMapLink.h
diff --git a/third_party/WebKit/Source/modules/accessibility/AXImageMapLink.h b/third_party/WebKit/Source/modules/accessibility/AXImageMapLink.h
index a52ba7071f605e811be7c971595a67585c90867a..19612fc60ddbe460db57417996ae78220f59b80d 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXImageMapLink.h
+++ b/third_party/WebKit/Source/modules/accessibility/AXImageMapLink.h
@@ -62,9 +62,9 @@ class AXImageMapLink final : public AXNodeObject {
   bool IsLink() const override { return true; }
   bool IsLinked() const override { return true; }
   AXObject* ComputeParent() const override;
-  void GetRelativeBounds(AXObject** out_container,
-                         FloatRect& out_bounds_in_container,
-                         SkMatrix44& out_container_transform) const override;
+  bool GetSimpleRelativeBounds(
+      AXObject** out_container,
+      FloatRect& out_bounds_in_container) const override;
 
  private:
   bool IsImageMapLink() const override { return true; }