Usecounter added for counting usage of addEventListener for PointerEvents.

third_party/WebKit/Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 2703 matching lines @@
             'events/EventDispatchMediator.h',
             'events/EventDispatcher.cpp',
             'events/EventDispatcher.h',
             'events/EventDispatchResult.h',
             'events/EventListenerMap.cpp',
             'events/EventPath.cpp',
             'events/EventPath.h',
             'events/EventQueue.h',
             'events/EventSender.h',
             'events/EventTarget.cpp',
+            'events/EventUtil.h',
+            'events/EventUtil.cpp',
             'events/FocusEvent.cpp',
             'events/FocusEvent.h',
             'events/GenericEventQueue.cpp',
             'events/GenericEventQueue.h',
             'events/GestureEvent.cpp',
             'events/GestureEvent.h',
             'events/HashChangeEvent.h',
             'events/InputEvent.cpp',
             'events/InputEvent.h',
             'events/KeyboardEvent.cpp',
@@ skipping 1384 matching lines @@
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'timing/PerformanceBaseTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'workers/WorkerThreadTestHelper.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }