Recently with compositor touch action study enabled, it seems that both allowed_touch_action_ and white_listed_touch_action_ could have no value when it is here:
https://cs.chromium.org/chromium/src/content/browser/renderer_host/input/touch_action_filter.cc?q=touchactionfilter&sq=package:chromium&dr=CSs&l=140

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0aeeec3f9282484094cd927cb484929e2f50f630

commit 0aeeec3f9282484094cd927cb484929e2f50f630
Author: Xida Chen <xidachen@chromium.org>
Date: Thu Jan 10 18:27:18 2019

[CompositorTouchAction] DumpWithoutCrashing at GSB

In the current code, we do DumpWithoutCrashing for every gesture when
the "CompositorTouchAction" study is enabled and that the white listed
touch action doesn't have value. This clears the gesture sequence
history and doesn't provide enough info.

This CL changes the place of DumpWithoutCrashing to be at GSB. With
this, we should have the history of gesture sequence.

Bug: 904648
Change-Id: I7707fd881e2ccf56c3d646f6310c68d14534b197
Reviewed-on: https://chromium-review.googlesource.com/c/1405289
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621650}
[modify] https://crrev.com/0aeeec3f9282484094cd927cb484929e2f50f630/content/browser/renderer_host/input/touch_action_filter.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/edabab55d7f4c7705e708723c39780458a5adc4d

commit edabab55d7f4c7705e708723c39780458a5adc4d
Author: Xida Chen <xidachen@chromium.org>
Date: Mon Jan 14 16:54:24 2019

[Debugging] Add DumpWithoutCrash in more cases

In this previous CL:
https://chromium-review.googlesource.com/c/chromium/src/+/1405289,
we added DumpWithoutCrash in GestureScrollBegin. It was in canary for
2 versions and there are only 2 reports.

This CL adds DumpWithoutCrash in all the cases where it could crash:
GestureScrollBegin, GestureScrollUpdate, GestureTapUnconfirmed and
hope that we can gather more info.

Bug: 904648
Change-Id: Iabaf43e4fb5375801ddef4fda8968f47d0c6cc00
Reviewed-on: https://chromium-review.googlesource.com/c/1409402
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#622480}
[modify] https://crrev.com/edabab55d7f4c7705e708723c39780458a5adc4d/content/browser/renderer_host/input/touch_action_filter.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/5461506aa9c494f631d46b633800e604e262f80c

commit 5461506aa9c494f631d46b633800e604e262f80c
Author: Xida Chen <xidachen@chromium.org>
Date: Thu Jan 17 20:12:46 2019

Set touch action auto at GestureTapDown if it has no value

It seems that the white listed touch action could have no value at
GestureTapDown. This CL sets it to Auto so that the browser won't
crash at GestureScrollBegin. We will monitor crashes to check whether
this actually solves the problem or not.

Bug: 904648
Change-Id: I533be7fea58c9807f049e8431c752e21f1deec79
Reviewed-on: https://chromium-review.googlesource.com/c/1418116
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623816}
[modify] https://crrev.com/5461506aa9c494f631d46b633800e604e262f80c/content/browser/renderer_host/input/touch_action_filter.cc

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0188f039c81ebea331c806f043435af20ea02cdb

commit 0188f039c81ebea331c806f043435af20ea02cdb
Author: Xida Chen <xidachen@chromium.org>
Date: Mon Jan 21 21:09:04 2019

[Debugging] Add debugging instrumentation in TouchActionFilter

This Cl adds more debugging strings in the TouchActionFilter, to collect
more info at DumpWithoutCrashing.

Bug: 904648
Change-Id: I5d524043efb6239c80d3a8e80db3ba3efc4eec59
Reviewed-on: https://chromium-review.googlesource.com/c/1425558
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624675}
[modify] https://crrev.com/0188f039c81ebea331c806f043435af20ea02cdb/content/browser/renderer_host/input/touch_action_filter.cc