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..79c5883adbe5a902eb3f90abb2a6e0addde0ea49 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.cpp
+++ b/third_party/WebKit/Source/modules/accessibility/AXInlineTextBox.cpp
@@ -56,13 +56,14 @@ void AXInlineTextBox::Detach() {
   inline_text_box_ = nullptr;
 }
 
-void AXInlineTextBox::GetRelativeBounds(
-    AXObject** out_container,
-    FloatRect& out_bounds_in_container,
-    SkMatrix44& out_container_transform) const {
+void AXInlineTextBox::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();
+  out_is_fixed_positioned = false;
 
   if (!inline_text_box_ || !ParentObject() ||
       !ParentObject()->GetLayoutObject())