Correct the (x, y) position of dragstart event initiated by touch event

LayoutTests/fast/events/touch/gesture/long-press-on-draggable-element-triggers-drag.html

Index: LayoutTests/fast/events/touch/gesture/long-press-on-draggable-element-triggers-drag.html
diff --git a/LayoutTests/fast/events/touch/gesture/long-press-on-draggable-element-triggers-drag.html b/LayoutTests/fast/events/touch/gesture/long-press-on-draggable-element-triggers-drag.html
index 9e6244713895a1950aa6d7b514b6cd5699cbf102..55648481beed85f1cde5ccd5fb279c5568f02d5e 100644
--- a/LayoutTests/fast/events/touch/gesture/long-press-on-draggable-element-triggers-drag.html
+++ b/LayoutTests/fast/events/touch/gesture/long-press-on-draggable-element-triggers-drag.html
@@ -18,14 +18,17 @@ function test()
     if (window.internals)
         internals.settings.setTouchDragDropEnabled(true);
 
-    document.ondragstart = function() { document.getElementById("dragResult").innerHTML = "PASS"; }
-    document.onmousedown = function() { document.getElementById("mouseDownResult").innerHTML = "FAIL"; }
-
     var dragableDiv = document.getElementById("draggableDiv");
 
     var x = draggableDiv.offsetParent.offsetLeft + draggableDiv.offsetLeft + 4;
     var y = draggableDiv.offsetParent.offsetTop + draggableDiv.offsetTop + draggableDiv.offsetHeight / 2;
 
+    document.ondragstart = function(e) {
+      if (e.x == x && e.y == y)
+        document.getElementById("dragResult").innerHTML = "PASS";
+    };
+    document.onmousedown = function() { document.getElementById("mouseDownResult").innerHTML = "FAIL"; };
+
     if (!window.eventSender)
         return;
     if (eventSender.gestureLongPress) {