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The inside marker could be a child of anonymous block not LI. When we are
finding symbol marker if meet anonymous block we should check its parent.

Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I8127ff9d38b351f97171f7a0cc8c8c3fdd896e6c
Reviewed-on: https://chromium-review.googlesource.com/1102296
Commit-Queue: cathie chen <cathiechen@tencent.com>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568790}