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In https://chromium-review.googlesource.com/c/chromium/src/+/1197462
we changed box_model_.Paint() to LineBoxListPainter so we no longer
supported text clip for descendants other than inline contents.

This CL calls ToLayoutBlock(box_model_).PaintObject() to support text
clip of other descendants, and still avoid the original double paint
offset issue of box_model_.Paint().

Bug: 880825
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I2c4b0e23df11bf300c01f9c804fb7e7d129f3aa0
Reviewed-on: https://chromium-review.googlesource.com/1211244Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589314}