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This patch implements hit testing on culled inline elements by:

- After hit testing each inline fragment, fall back to the legacy
  LayoutObject tree to see if there is any culled inline ancestor
  element, and hit test each of them. This part replicates relevant
  logic in InlineFlowBox::NodeAtPoint.

- Adds a |parent_fragment| parameter to
  LayoutInline::HitTestCulledInline to ensure that only descendant
  rects of |parent_fragment| are hit tested. This ensure that, e.g.,
  for a multi-line SPAN, we hit test its rects line-by-line, to ensure
  correct hit test ordering.

Tests: 6 layout tests are fixed. One of them is rebaselined due to
whitespace-only difference in text dump.

Bug: 851075
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_layout_ng;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ic303ce5f8a192f92ad326c304a9d84fa898e4c94
Reviewed-on: https://chromium-review.googlesource.com/1110737Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570335}