Keep track of fixed positioning in accessibility tree.

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

Index: third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.h
diff --git a/third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.h b/third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.h
index 923cbcf264051871f96ace4b165fa5be28dcad95..6561e7763c21be72c4c7ca6a8090dead4403c9c7 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.h
+++ b/third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.h
@@ -61,7 +61,8 @@ class AXInlineTextBox final : public AXObject {
   void GetWordBoundaries(Vector<AXRange>&) const override;
   void GetRelativeBounds(AXObject** out_container,
                          FloatRect& out_bounds_in_container,
-                         SkMatrix44& out_container_transform) const override;
+                         SkMatrix44& out_container_transform,
+                         bool& out_is_fixed_positioned) const override;
   AXObject* ComputeParent() const override;
   AccessibilityTextDirection GetTextDirection() const override;
   Node* GetNode() const override { return inline_text_box_->GetNode(); }