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

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

Index: third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-button-test_touch-manual-automation.js
diff --git a/third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-button-test_touch-manual-automation.js b/third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-button-test_touch-manual-automation.js
index d972b5a3f8dad5862a0c318738862da4462c6140..8e6a5db146b3efcfd97989c2e0984ba0f2375ca6 100644
--- a/third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-button-test_touch-manual-automation.js
+++ b/third_party/WebKit/LayoutTests/imported/wpt_automation/pointerevents/pointerevent_touch-action-button-test_touch-manual-automation.js
@@ -1,8 +1,24 @@
 importAutomationScript('/pointerevents/pointerevent_common_input.js');
 
-function inject_input() {
-  touchScrollUpInTarget('target0');
-  touchScrollLeftInTarget('target0');
-  touchTapInTarget('btnComplete');
+function callback_function() {
+  window.setTimeout(function() {
+    touchTapInTarget('btnComplete');}
+    , scrollReturnInterval);
 }
 
+function inject_input() {
+   var target = document.getElementById("target0");
+   var targetRect = target.getBoundingClientRect();
+
+   var button = document.getElementsByTagName("button")[0];
+   var buttonRect = button.getBoundingClientRect();
+
+   var x = (buttonRect.left - targetRect.left)/2;
+   touchScrollByPosition(x, targetRect.top + 100, 30, "down");
+   touchScrollByPosition(x, targetRect.top + 100, 30, "right", callback_function);
+
+   window.setTimeout(function() {
+    touchSmoothScrollUp(button);
+    touchSmoothScrollLeft(button, callback_function);
+    } , 4*scrollReturnInterval);
+}