Add support for DOM Level 3 WheelEvent

Source/web/WebInputEventConversion.cpp

Index: Source/web/WebInputEventConversion.cpp
diff --git a/Source/web/WebInputEventConversion.cpp b/Source/web/WebInputEventConversion.cpp
index c2735f78667df09eddc47fafa6d0d69b09756252..775039f753d14abbaf25660f3d99dd5e2a312805 100644
--- a/Source/web/WebInputEventConversion.cpp
+++ b/Source/web/WebInputEventConversion.cpp
@@ -578,15 +578,14 @@ WebMouseEventBuilder::WebMouseEventBuilder(const WebCore::Widget* widget, const
 
 WebMouseWheelEventBuilder::WebMouseWheelEventBuilder(const Widget* widget, const WebCore::RenderObject* renderObject, const WheelEvent& event)
 {
-    if (event.type() != eventNames().mousewheelEvent)
+    if (event.type() != eventNames().wheelEvent && event.type() != eventNames().mousewheelEvent)
         return;
     type = WebInputEvent::MouseWheel;
     updateWebMouseEventFromWebCoreMouseEvent(event, *widget, *renderObject, *this);
     deltaX = static_cast<float>(event.rawDeltaX());
     deltaY = static_cast<float>(event.rawDeltaY());
-    // The 120 is from WheelEvent::initWheelEvent().
-    wheelTicksX = static_cast<float>(event.wheelDeltaX()) / 120;
-    wheelTicksY = static_cast<float>(event.wheelDeltaY()) / 120;
+    wheelTicksX = static_cast<float>(event.wheelDeltaX()) / WheelEvent::TickMultiplier;
+    wheelTicksY = static_cast<float>(event.wheelDeltaY()) / WheelEvent::TickMultiplier;
     scrollByPage = event.deltaMode() == WheelEvent::DOM_DELTA_PAGE;
 }