Add automation scripts for the new pointer event touch action wpl tests.

third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-pan-left-css_touch-manual-automation.js

 importAutomationScript('/pointerevents/pointerevent_common_input.js');
 
 function inject_input() {
   return touchScrollInTarget('#target0', 'down').then(function() {
     return touchScrollInTarget('#target0', 'right');
   }).then(function() {
+    return touchScrollInTarget('#target0', 'left');
+  }).then(function() {
     return touchTapInTarget('#btnComplete');
   });
 }