Usecounter added for counting usage of addEventListener for PointerEvents.

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 55f80e05075c26069a4d01113f5e57cbda2da11d..78e35769e1965fbf4fe478b78d6ecc88d1926961 100644
--- a/third_party/WebKit/Source/core/events/EventTarget.cpp
+++ b/third_party/WebKit/Source/core/events/EventTarget.cpp
@@ -36,6 +36,7 @@
 #include "core/dom/ExceptionCode.h"
 #include "core/editing/Editor.h"
 #include "core/events/Event.h"
+#include "core/events/EventUtil.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/UseCounter.h"
@@ -152,6 +153,11 @@ bool EventTarget::addEventListenerInternal(const AtomicString& eventType, EventL
     if (!listener)
         return false;
 
+    if (EventUtil::isPointerEventType(eventType)) {

[bokan, 2016/05/10 22:52:01]

Put this in the addedEventListener method below.

[sahel, 2016/05/11 21:15:02]

Done.

+        if (LocalDOMWindow* executingWindow = this->executingWindow()) {
+            UseCounter::count(executingWindow->document(), UseCounter::PointerEventAddListenerCount);
+        }
+    }
     V8DOMActivityLogger* activityLogger = V8DOMActivityLogger::currentActivityLoggerIfIsolatedWorld();
     if (activityLogger) {
         Vector<String> argv;