Use method registration approach for creating events on core and modules.

Source/core/Init.cpp

Index: Source/core/Init.cpp
diff --git a/Source/core/Init.cpp b/Source/core/Init.cpp
index 178dbde9bf0d2f4f3ba93379fd18cd9d930335db..bacf2b37b672a319b04b04ee85b109b0cf88b797 100644
--- a/Source/core/Init.cpp
+++ b/Source/core/Init.cpp
@@ -46,6 +46,8 @@
 #include "XLinkNames.h"
 #include "XMLNSNames.h"
 #include "XMLNames.h"
+#include "core/dom/Document.h"
+#include "core/events/EventFactory.h"
 #include "core/html/parser/HTMLParserThread.h"
 #include "platform/EventTracer.h"
 #include "platform/Partitions.h"
@@ -65,6 +67,16 @@ void CoreInitializer::initEventTargetNames()
     EventTargetNames::init();
 }
 
+void CoreInitializer::registerEventFactory()
+{
+    static bool isRegistered = false;
+    if (isRegistered)
+        return;
+    isRegistered = true;
+
+    Document::registerEventFactory(new EventFactory());
+}
+
 void CoreInitializer::init()
 {
     if (m_isInited)
@@ -96,6 +108,8 @@ void CoreInitializer::init()
     Partitions::init();
     EventTracer::initialize();
 
+    registerEventFactory();
+
     // Ensure that the main thread's thread-local data is initialized before
     // starting any worker threads.
     PlatformThreadData::current();