Keep track of fixed positioning in accessibility tree.

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

Index: third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.cpp
diff --git a/third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.cpp b/third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.cpp
index 068a1d7b27b3a6b65f2df4b1b5f126f5ef02c08c..03806892ee1ad2db54fb0e81df765d154d0e663f 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.cpp
@@ -56,17 +56,15 @@ void AXInlineTextBox::Detach() {
   inline_text_box_ = nullptr;
 }
 
-void AXInlineTextBox::GetRelativeBounds(
+bool AXInlineTextBox::GetSimpleRelativeBounds(
     AXObject** out_container,
-    FloatRect& out_bounds_in_container,
-    SkMatrix44& out_container_transform) const {
+    FloatRect& out_bounds_in_container) const {
   *out_container = nullptr;
   out_bounds_in_container = FloatRect();
-  out_container_transform.setIdentity();
 
   if (!inline_text_box_ || !ParentObject() ||
       !ParentObject()->GetLayoutObject())
-    return;
+    return false;
 
   *out_container = ParentObject();
   out_bounds_in_container = FloatRect(inline_text_box_->LocalBounds());
@@ -77,6 +75,7 @@ void AXInlineTextBox::GetRelativeBounds(
   FloatRect parent_bounding_box =
       parent_layout_object->LocalBoundingBoxRectForAccessibility();
   out_bounds_in_container.MoveBy(-parent_bounding_box.Location());
+  return true;
 }
 
 bool AXInlineTextBox::ComputeAccessibilityIsIgnored(