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There is a discrepancy between BlinkAXTreeSource::GetChildren() and
BlinkAXTreeSource::GetParent().

- GetChildren() does not return direct children when they are ignored
  and not included in the tree. This is because when
  AXNodeObject::InsertChild() visits an object that is ignored and not
  included in tree, it recurses and inserts the next generation.
- GetParent() always returns the direct parent.

This discrepancy an lead to confusion within AXTreeSerializer, with
respect to analyzing reparenting.

Bug: 651614
Change-Id: I4e4c8c6a2900cf5516cc98f3b260e619220ea7e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095882
Auto-Submit: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Adam Ettenberger <Adam.Ettenberger@microsoft.com>
Reviewed-by: Jacques Newman <janewman@microsoft.com>
Commit-Queue: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750243}