There are several different stable signature, but from random sampling, most of them are from the same CHECK failure.

https://crash.corp.google.com/browse?q=expanded_custom_data.ChromeCrashProto.magic_signature_1.name+LIKE+%27blink%3A%3ANGLineBreaker%3A%3ABreakText%25%27+and+product.version+%3E%3D+%2772.0.3603%27

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/971045a9135027671906556f210c27d8b6bed911

commit 971045a9135027671906556f210c27d8b6bed911
Author: Koji Ishii <kojii@chromium.org>
Date: Mon Dec 17 18:14:18 2018

[LayoutNG] Fix crash in NGLineBreaker for RTL

This patch fixes a crash in NGLineBreaker for RTL.

https://dictionnaire.reverso.net/anglais-francais/weirdo
causes a crash because one of ShapeResult in NGInlienItem
contains 0 characters. This was caused by an optimization
to find runs in ShapeResult sometimes fails to find the run.

Added more DCHECK in NGInlineNode::ShapeText to ensure
ShapeResult are good before it exits.

Bug: 900898,  915567 
Change-Id: I2e5023b5602d94ea8af43d665639553b1658e0c5
Reviewed-on: https://chromium-review.googlesource.com/c/1379610
Reviewed-by: Emil A Eklund <eae@chromium.org>
Commit-Queue: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#617160}
[modify] https://crrev.com/971045a9135027671906556f210c27d8b6bed911/third_party/blink/renderer/core/layout/ng/inline/ng_inline_node.cc
[modify] https://crrev.com/971045a9135027671906556f210c27d8b6bed911/third_party/blink/renderer/platform/fonts/shaping/harfbuzz_shaper_test.cc
[modify] https://crrev.com/971045a9135027671906556f210c27d8b6bed911/third_party/blink/renderer/platform/fonts/shaping/shape_result.cc