Set relatedtarget for dragleave/enter events

third_party/WebKit/LayoutTests/external/wpt_automation/pointerevents/pointerevent_common_input.js

 // This file contains the commonly used functions in pointerevent tests.
 
 const scrollOffset = 20;
 const boundaryOffset = 2;
 
 function delayPromise(delay) {
   return new Promise(function(resolve, reject) {
     window.setTimeout(resolve, delay);
   });
 }
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             { name: 'pointerMove', x: xPosition, y: yPosition },
             { name: 'pointerDown', x: xPosition, y: yPosition },
             { name: 'pointerUp' }
         ]}], resolve);
     } else {
       reject();
     }
   });
 }
 
+// Drag and drop actions
+function mouseDragAndDropInTargets(targetSelectorList) {
+  return new Promise(function(resolve, reject) {
+    if (window.eventSender) {
+      scrollPageIfNeeded(targetSelectorList[0], document);
+      var target = document.querySelector(targetSelectorList[0]);
+      var targetRect = target.getBoundingClientRect();
+      var xPosition = targetRect.left + boundaryOffset;
+      var yPosition = targetRect.top + boundaryOffset;
+      eventSender.mouseMoveTo(xPosition, yPosition);
+      eventSender.mouseDown();
+      eventSender.leapForward(100);
+      for (var i = 1; i < targetSelectorList.length; i++) {
+        scrollPageIfNeeded(targetSelectorList[i], document);
+        target = document.querySelector(targetSelectorList[i]);
+        targetRect = target.getBoundingClientRect();
+        xPosition = targetRect.left + boundaryOffset;
+        yPosition = targetRect.top + boundaryOffset;
+        eventSender.mouseMoveTo(xPosition, yPosition);
+      }
+      eventSender.mouseUp();
+      resolve();
+    } else {
+      reject();
+    }
+  });
+}
+
 // Keyboard inputs.
 function keyboardScroll(direction) {
   return new Promise(function(resolve, reject) {
     if (window.eventSender) {
       if (direction == 'down')
         eventSender.keyDown('ArrowDown');
       else if (direction == 'right')
         eventSender.keyDown('ArrowRight');
       else
         reject();
@@ skipping 28 matching lines @@
   });
 }
 
 {
   var pointerevent_automation = async_test("PointerEvent Automation");
   // Defined in every test and should return a promise that gets resolved when input is finished.
   inject_input().then(function() {
     pointerevent_automation.done();
   });
 }