Adjust DOMWindow properties to emulate old style pinch semantics

Source/core/frame/PinchViewport.cpp

Index: Source/core/frame/PinchViewport.cpp
diff --git a/Source/core/frame/PinchViewport.cpp b/Source/core/frame/PinchViewport.cpp
index 30d86e8871a7e4a60513600ee62c95ac916ea54d..cd7904cd7e0a23f731fb45fbd6c32f054c3247dd 100644
--- a/Source/core/frame/PinchViewport.cpp
+++ b/Source/core/frame/PinchViewport.cpp
@@ -199,6 +199,9 @@ void PinchViewport::setScaleAndLocation(float scale, const FloatPoint& location)
         ASSERT(coordinator);
         coordinator->scrollableAreaScrollLayerDidChange(this);
 
+        Document* document = mainFrame()->document();
+        document->enqueueScrollEventForNode(document);
+
         valuesChanged = true;
     }