Break on window close when the inspector is open

Source/core/inspector/InspectorDOMDebuggerAgent.cpp

Index: Source/core/inspector/InspectorDOMDebuggerAgent.cpp
diff --git a/Source/core/inspector/InspectorDOMDebuggerAgent.cpp b/Source/core/inspector/InspectorDOMDebuggerAgent.cpp
index f60ee761db34e18ac6b057eb080ba111cf2dd1fb..7f75e94babec32927f6f6a2837c9ebf08d927cd4 100644
--- a/Source/core/inspector/InspectorDOMDebuggerAgent.cpp
+++ b/Source/core/inspector/InspectorDOMDebuggerAgent.cpp
@@ -63,6 +63,7 @@ static const char animationFrameFiredEventName[] = "animationFrameFired";
 static const char setTimerEventName[] = "setTimer";
 static const char clearTimerEventName[] = "clearTimer";
 static const char timerFiredEventName[] = "timerFired";
+static const char windowCloseEventName[] = "close";
 static const char customElementCallbackName[] = "customElementCallback";
 static const char webglErrorFiredEventName[] = "webglErrorFired";
 static const char webglWarningFiredEventName[] = "webglWarningFired";
@@ -481,6 +482,11 @@ void InspectorDOMDebuggerAgent::willHandleEvent(EventTarget* target, Event* even
     pauseOnNativeEventIfNeeded(preparePauseOnNativeEventData(event->type(), &targetName), false);
 }
 
+void InspectorDOMDebuggerAgent::willCloseWindow()
+{
+    pauseOnNativeEventIfNeeded(preparePauseOnNativeEventData(windowCloseEventName, nullptr), true);
+}
+
 void InspectorDOMDebuggerAgent::willExecuteCustomElementCallback(Element*)
 {
     pauseOnNativeEventIfNeeded(preparePauseOnNativeEventData(customElementCallbackName, 0), false);