Keep track of fixed positioning in accessibility tree.

ui/accessibility/ax_tree.cc

Index: ui/accessibility/ax_tree.cc
diff --git a/ui/accessibility/ax_tree.cc b/ui/accessibility/ax_tree.cc
index d2c7f0d524f52caeda6727e7239e37aabdcd68a5..3e5cf6524d9c83de7d951640372fdfa021d1a1c8 100644
--- a/ui/accessibility/ax_tree.cc
+++ b/ui/accessibility/ax_tree.cc
@@ -199,14 +199,17 @@ gfx::RectF AXTree::RelativeToTreeBounds(const AXNode* node,
     if (!container || container == node)
       break;
 
-    gfx::RectF container_bounds = container->data().location;
+    const ui::AXNodeData& container_data = container->data();
+    gfx::RectF container_bounds = container_data.location;
     bounds.Offset(container_bounds.x(), container_bounds.y());
 
-    int scroll_x = 0;
-    int scroll_y = 0;
-    if (container->data().GetIntAttribute(ui::AX_ATTR_SCROLL_X, &scroll_x) &&
-        container->data().GetIntAttribute(ui::AX_ATTR_SCROLL_Y, &scroll_y)) {
-      bounds.Offset(-scroll_x, -scroll_y);
+    if (!node->data().is_fixed_positioned) {
+      int scroll_x = 0;
+      int scroll_y = 0;
+      if (container_data.GetIntAttribute(ui::AX_ATTR_SCROLL_X, &scroll_x) &&
+          container_data.GetIntAttribute(ui::AX_ATTR_SCROLL_Y, &scroll_y)) {
+        bounds.Offset(-scroll_x, -scroll_y);
+      }
     }
 
     node = container;