GitLab

Switching flutter bridge to use the default action verb kClick
rather than the boolean attribute kClickable.  The boolean
attribute was added specifically for Android and has unwanted
side-effects including not allowing nodes marked clickable
to have navigable descendants.  This CL removes a previous
work around that was caused by using clickable attribute.

Also changing the touch exploration controller to
always issue a simulated tap.  Ax gestures do not
always get propagated to the tap listener via the flutter
bridge.  This will make for a better user experience
for some ui elements that require simulated taps.

Bug: None
Test: Local display assistant build, unittests
Change-Id: I8bb9204d78ef61bb8afc727b9b6b41e2ca05390c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2431557Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811732}