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This patch fixes AddOutlineRects to include continuation
when the first line is empty.

In such case, NGInlineLayoutAlgorithm suppresses box
fragments, and thus we cannot reach to the continuation by
traversing fragment tree.

This patch detects such case and traverse the first
LayoutInline instead.

Bug: 889721
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng
Change-Id: I0e3bbd895501231b76775b074b35310037a3e113
Reviewed-on: https://chromium-review.googlesource.com/1252484Reviewed-by: Aleks Totic <atotic@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595693}