Add wheel support to sky-scrollable

sky/engine/web/WebViewImpl.cpp

Index: sky/engine/web/WebViewImpl.cpp
diff --git a/sky/engine/web/WebViewImpl.cpp b/sky/engine/web/WebViewImpl.cpp
index b2db8490c33e788771b5dfd0e34b7f5e74545c2c..c1c8c7b708284a147aa15032000ddfbd9039b0fe 100644
--- a/sky/engine/web/WebViewImpl.cpp
+++ b/sky/engine/web/WebViewImpl.cpp
@@ -339,6 +339,11 @@ bool WebViewImpl::handleInputEvent(const WebInputEvent& inputEvent)
         return m_page->mainFrame()->newEventHandler().handleKeyboardEvent(event);
     }
 
+    if (WebInputEvent::isWheelEventType(inputEvent.type)) {
+        const WebWheelEvent& event = static_cast<const WebWheelEvent&>(inputEvent);
+        return m_page->mainFrame()->newEventHandler().handleWheelEvent(event);
+    }
+
     return false;
 }