The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0d326b48bd894605b4e41e22f6f085af7c12274b

commit 0d326b48bd894605b4e41e22f6f085af7c12274b
Author: Xida Chen <xidachen@chromium.org>
Date: Wed Aug 22 20:39:26 2018

Reset touch action at TouchActionFilter's constructor

When we start processing a gesture event, the
OnHasTouchEventHandler(false) IPC message may not yet
be received which means the |scrolling_touch_action_|
has no value and that results a crash.

This CL fixes the problem by call ResetTouchAction()
in TouchActionFilter's constructor. At that moment, the
|has_touch_event_handler_| is default to false which
will set both |allowed_touch_action_| and
|scrolling_touch_action_| to Auto.

Bug:  850238 ,  851644 
Change-Id: I36f3edf2b9292347f184458aa059904af1a2f597
Reviewed-on: https://chromium-review.googlesource.com/1180592
Commit-Queue: Xida Chen <xidachen@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585234}
[modify] https://crrev.com/0d326b48bd894605b4e41e22f6f085af7c12274b/content/browser/renderer_host/input/touch_action_filter.cc
[modify] https://crrev.com/0d326b48bd894605b4e41e22f6f085af7c12274b/content/browser/renderer_host/input/touch_action_filter.h
[modify] https://crrev.com/0d326b48bd894605b4e41e22f6f085af7c12274b/content/browser/renderer_host/input/touch_action_filter_unittest.cc