The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/33acc1ce6e24169847e37200f680dc7e451a12a1

commit 33acc1ce6e24169847e37200f680dc7e451a12a1
Author: Philip Rogers <pdr@chromium.org>
Date: Wed Jun 13 18:43:19 2018

Update inline touch action rects during paint

This patch extends support for painting touch action rects (behind the
PaintTouchActionRects flag) to inline painting. With this patch, the
inline box's background hit test rect is painted. To reduce duplicate
code, InlineFlowBoxPainter::AdjustedPaintRect was introduced.

Because touch action rects are painted the same way as backgrounds, this
approach correctly handles vertical-rl writing modes.

Bug: 836905,  852013 
Cq-Include-Trybots: luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I53296e0fc6e939e220a90fee40e07492a9da113a
Reviewed-on: https://chromium-review.googlesource.com/1097562
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566932}
[modify] https://crrev.com/33acc1ce6e24169847e37200f680dc7e451a12a1/third_party/blink/renderer/core/page/scrolling/scrolling_coordinator_test.cc
[modify] https://crrev.com/33acc1ce6e24169847e37200f680dc7e451a12a1/third_party/blink/renderer/core/paint/inline_flow_box_painter.cc
[modify] https://crrev.com/33acc1ce6e24169847e37200f680dc7e451a12a1/third_party/blink/renderer/core/paint/inline_flow_box_painter.h
[add] https://crrev.com/33acc1ce6e24169847e37200f680dc7e451a12a1/third_party/blink/renderer/core/testing/data/touch-action-on-inline.html
[add] https://crrev.com/33acc1ce6e24169847e37200f680dc7e451a12a1/third_party/blink/renderer/core/testing/data/touch-action-with-vertical-rl-writing-mode.html

This bug is fixed under --enable-blink-features=PaintTouchActionRects