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

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

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

[Navid Zolghadr, 2016/09/08 19:49:20]

Is there any difference if you go in for these then's like this or you just put
them all in sequence like the #btnComplete one?

[dtapuska, 2016/09/08 20:00:08]

sure I thought it was done this way. But I've changed it around.

+    })
+  }).then(function() {
+    return touchTapInTarget('#btnComplete');
+  });
+}