Refactoring: Add Event::createBubble.

Source/core/dom/Event.h

Index: Source/core/dom/Event.h
diff --git a/Source/core/dom/Event.h b/Source/core/dom/Event.h
index 7f705c42d7eb92af109a4f0c66cf63e374db1870..560ace8c42ef2cd9f92baf81695da05d986d2ec9 100644
--- a/Source/core/dom/Event.h
+++ b/Source/core/dom/Event.h
@@ -88,6 +88,10 @@ public:
     {
         return adoptRef(new Event(type, false, true));
     }
+    static PassRefPtr<Event> createBubble(const AtomicString& type)
+    {
+        return adoptRef(new Event(type, true, false));
+    }
     static PassRefPtr<Event> create(const AtomicString& type, bool canBubble, bool cancelable)
     {
         return adoptRef(new Event(type, canBubble, cancelable));