Usecounter added for counting usage of addEventListener for PointerEvents.

third_party/WebKit/Source/core/events/EventUtil.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EventUtil_h
+#define EventUtil_h
+
+#include "core/EventTypeNames.h"
+
+namespace blink {
+
+class EventUtil {

[bokan, 2016/05/10 22:52:02]

If this is just going to be a collection of functions, just make EventUtil a
namespace. Also, put the implementation into a separate .cpp file. (You'll want
to add both the .h and .cpp files to Soure/core/core.gypi)

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

I changed the class to the namespace.
I had the implementation in the .h file because it was an inline function and I
wanted to keep it inline, now the implementation is in a cpp file and the
function is not inline anymore. Is this ok?
Should I also add them to Source/core/core.gni?

[bokan, 2016/05/11 21:19:59]

Yah, that's fine, it's not in a hot code path.

+
+public:
+    static inline bool isPointerEventType(const AtomicString& eventType)
+    {
+        return eventType == EventTypeNames::gotpointercapture
+            || eventType == EventTypeNames::lostpointercapture
+            || eventType == EventTypeNames::pointercancel
+            || eventType == EventTypeNames::pointerdown
+            || eventType == EventTypeNames::pointerenter
+            || eventType == EventTypeNames::pointerleave
+            || eventType == EventTypeNames::pointermove
+            || eventType == EventTypeNames::pointerout
+            || eventType == EventTypeNames::pointerover
+            || eventType == EventTypeNames::pointerup;
+    }
+
+private:
+    EventUtil() {};
+};
+
+} // namespace blink
+
+#endif // EventUtil_h