Make gpuBenchmarking.smoothDrag or smoothScrollBy scroll properly in pointer event tests

third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-span-test_touch-manual-automation.js

Index: third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-span-test_touch-manual-automation.js
diff --git a/third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-span-test_touch-manual-automation.js b/third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-span-test_touch-manual-automation.js
index d972b5a3f8dad5862a0c318738862da4462c6140..f3357f3830175901f85b79bf544ee6f78cad6d6a 100644
--- a/third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-span-test_touch-manual-automation.js
+++ b/third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-span-test_touch-manual-automation.js
@@ -1,8 +1,22 @@
 importAutomationScript('/pointerevents/pointerevent_common_input.js');
 
-function inject_input() {
-  touchScrollUpInTarget('target0');
-  touchScrollLeftInTarget('target0');
+function callback_function() {
   touchTapInTarget('btnComplete');
 }
 
+function inject_input() {
+   var target = document.getElementById("target0");
+   var targetRect = target.getBoundingClientRect();
+
+   var span = document.getElementById("testspan");
+   var spanRect = span.getBoundingClientRect();
+
+   var x = (spanRect.left - targetRect.left)/2;
+   touchScrollByPosition(x, targetRect.top + 100, 30, "down");
+   touchScrollByPosition(x, targetRect.top + 100, 30, "right");
+
+   window.setTimeout(function() {
+    touchScrollUpInTarget('testspan', false);
+    touchScrollLeftInTarget('testspan', false, callback_function);
+    } , 6*scrollReturnInterval);
+}