No pointer captured when the pointer lock is applied

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);
   });
 }
@@ skipping 175 matching lines @@
         eventSender.continuousMouseScrollBy(0, -scrollOffset);
       else
         reject();
       resolve();
     } else {
       reject();
     }
   });
 }
 
+// Request a pointer lock and capture.
+function mouseRequestPointerLockAndCaptureInTarget(targetSelector, targetFrame) {
+  var targetDocument = document;
+  var frameLeft = 0;
+  var frameTop = 0;
+  var button = 'left';
+  if (targetFrame !== undefined) {
+    targetDocument = targetFrame.contentDocument;
+    var frameRect = targetFrame.getBoundingClientRect();
+    frameLeft = frameRect.left;
+    frameTop = frameRect.top;
+  }
+  return new Promise(function(resolve, reject) {
+    if (window.chrome && chrome.gpuBenchmarking) {
+      scrollPageIfNeeded(targetSelector, targetDocument);
+      var target = targetDocument.querySelector(targetSelector);
+      var targetRect = target.getBoundingClientRect();
+      var xPosition = frameLeft + targetRect.left + boundaryOffset;
+      var yPosition = frameTop + targetRect.top + boundaryOffset;
+
+      chrome.gpuBenchmarking.pointerActionSequence( [
+        {source: 'mouse',
+         actions: [
+            {name: 'pointerMove', x: xPosition, y: yPosition},
+            {name: 'pointerDown', x: xPosition, y: yPosition, button: 'left'},

[Navid Zolghadr, 2017/05/17 16:30:10]

Can you add a little move after the left pressed as well?

[lanwei, 2017/05/19 15:05:00]

Done.

+            {name: 'pause', duration: 0.1},
+            {name: 'pointerDown', x: xPosition, y: yPosition, button: 'middle'},
+            {name: 'pointerMove', x: xPosition + 30, y: yPosition + 30},
+        ]}], resolve);
+    } else {
+      reject();
+    }
+  });
+}
+
 // Touch inputs.
 function touchTapInTarget(targetSelector, targetFrame) {
   var targetDocument = document;
   var frameLeft = 0;
   var frameTop = 0;
   if (targetFrame !== undefined) {
     targetDocument = targetFrame.contentDocument;
     var frameRect = targetFrame.getBoundingClientRect();
     frameLeft = frameRect.left;
     frameTop = frameRect.top;
@@ skipping 275 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();
   });
 }