Populates sourceDevice attribute into MouseEvent

Source/core/input/EventHandler.cpp

Index: Source/core/input/EventHandler.cpp
diff --git a/Source/core/input/EventHandler.cpp b/Source/core/input/EventHandler.cpp
index 19698b6bf5a0b587896378adc6a5058273c8515d..b2bfb49105cf93f873f719b9b5058209772978d6 100644
--- a/Source/core/input/EventHandler.cpp
+++ b/Source/core/input/EventHandler.cpp
@@ -1287,7 +1287,7 @@ bool EventHandler::dispatchDragEvent(const AtomicString& eventType, Node* dragTa
         0, event.globalPosition().x(), event.globalPosition().y(), event.position().x(), event.position().y(),
         event.movementDelta().x(), event.movementDelta().y(),
         event.ctrlKey(), event.altKey(), event.shiftKey(), event.metaKey(),
-        0, MouseEvent::platformModifiersToButtons(event.modifiers()), nullptr, dataTransfer);
+        0, MouseEvent::platformModifiersToButtons(event.modifiers()), nullptr, dataTransfer, false, event.syntheticEventType(), event.timestamp());
 
     dragTarget->dispatchEvent(me.get(), IGNORE_EXCEPTION);
     return me->defaultPrevented();