Usage counter for add/removeEventListener third argument.

third_party/WebKit/Source/bindings/core/v8/custom/V8EventTargetCustom.cpp

Index: third_party/WebKit/Source/bindings/core/v8/custom/V8EventTargetCustom.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/custom/V8EventTargetCustom.cpp b/third_party/WebKit/Source/bindings/core/v8/custom/V8EventTargetCustom.cpp
index 97ae719532d8f7bc7cb8bebaaf27e4314e765f60..8903ee9a3b9c11ea96e917833db4165e802c85b2 100644
--- a/third_party/WebKit/Source/bindings/core/v8/custom/V8EventTargetCustom.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/custom/V8EventTargetCustom.cpp
@@ -42,6 +42,10 @@ void V8EventTarget::addEventListenerMethodPrologueCustom(const v8::FunctionCallb
         UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()),
             info.Length() == 0 ? UseCounter::AddEventListenerNoArguments : UseCounter::AddEventListenerOneArgument);
     }
+    if (info.Length() >= 3 && info[2]->IsObject()) {
+        UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()),
+            UseCounter::AddEventListenerThirdArgumentIsObject);
+    }
 }
 
 void V8EventTarget::addEventListenerMethodEpilogueCustom(const v8::FunctionCallbackInfo<v8::Value>& info, EventTarget* impl)
@@ -56,6 +60,10 @@ void V8EventTarget::removeEventListenerMethodPrologueCustom(const v8::FunctionCa
         UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()),
             info.Length() == 0 ? UseCounter::RemoveEventListenerNoArguments : UseCounter::RemoveEventListenerOneArgument);
     }
+    if (info.Length() >= 3 && info[2]->IsObject()) {
+        UseCounter::countIfNotPrivateScript(info.GetIsolate(), callingExecutionContext(info.GetIsolate()),
+            UseCounter::RemoveEventListenerThirdArgumentIsObject);
+    }
 }
 
 void V8EventTarget::removeEventListenerMethodEpilogueCustom(const v8::FunctionCallbackInfo<v8::Value>& info, EventTarget* impl)