Added counters for pointer boundary events fired.

third_party/WebKit/Source/core/events/EventTarget.cpp

Index: third_party/WebKit/Source/core/events/EventTarget.cpp
diff --git a/third_party/WebKit/Source/core/events/EventTarget.cpp b/third_party/WebKit/Source/core/events/EventTarget.cpp
index d98bb138c288ff47c9a2f04c3a6e7e6343915351..3e1f2958e61a4d746b3a69955d02632e43e43849 100644
--- a/third_party/WebKit/Source/core/events/EventTarget.cpp
+++ b/third_party/WebKit/Source/core/events/EventTarget.cpp
@@ -588,6 +588,21 @@ bool EventTarget::fireEventListeners(Event* event, EventTargetData* d, EventList
             if (event->isPointerEvent() && static_cast<PointerEvent*>(event)->pointerType() == "touch")
                 UseCounter::count(executingWindow->document(), UseCounter::PointerDownFiredForTouch);
         }
+    } else if (checkTypeThenUseCount(event, EventTypeNames::pointerenter, UseCounter::PointerEnterLeaveFired)
+        || checkTypeThenUseCount(event, EventTypeNames::pointerleave, UseCounter::PointerEnterLeaveFired)
+        || checkTypeThenUseCount(event, EventTypeNames::pointerover, UseCounter::PointerOverOutFired)
+        || checkTypeThenUseCount(event, EventTypeNames::pointerout, UseCounter::PointerOverOutFired)) {
+        LocalDOMWindow* executingWindow = this->executingWindow();
+        Node* node = toNode();
+        if (executingWindow && node && node->getNodeType() == Node::kElementNode && event->isPointerEvent()) {
+            const Element* element = static_cast<Element*>(node);
+            const PointerEvent* pointerEvent = static_cast<PointerEvent*>(event);
+            const UseCounter::Feature feature = (event->type() == EventTypeNames::pointerenter || event->type() == EventTypeNames::pointerleave)
+                ? UseCounter::PointerEnterLeaveFiredWhileCaptured
+                : UseCounter::PointerOverOutFiredWhileCaptured;
+            if (element->hasProcessedPointerCapture(pointerEvent->pointerId()))
+                UseCounter::count(executingWindow->document(), feature);
+        }
     }
 
     ExecutionContext* context = getExecutionContext();