Add the ability to return descedant event listeners.

third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp

Index: third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp
diff --git a/third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp b/third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp
index 0ef90d1f6d2bb7403fd3e7d385346f0ef67c87fa..c1ab28a18e581fcc07cb85c259e0c2df46919ec1 100644
--- a/third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp
+++ b/third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp
@@ -47,9 +47,9 @@ void ThreadDebugger::didExecuteScript(v8::Isolate* isolate)
         data->threadDebugger()->debugger()->didExecuteScript(isolate->GetCurrentContext());
 }
 
-void ThreadDebugger::eventListeners(v8::Local<v8::Value> value, V8EventListenerInfoList& result)
+void ThreadDebugger::eventListeners(v8::Local<v8::Value> value, unsigned filterMask, V8EventListenerInfoList& result)
 {
-    InspectorDOMDebuggerAgent::eventListenersInfoForTarget(m_isolate, value, result);
+    InspectorDOMDebuggerAgent::eventListenersInfoForTarget(m_isolate, value, filterMask, result);
 }
 
 String16 ThreadDebugger::valueSubtype(v8::Local<v8::Value> value)