Tell the root layer it has a wheel handler when a select is active

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 3cd8a54068bd35a1e95930c193eb081fc28904e9..d218728aa3f0acd09cdcb0110d99d7c8f644d03a 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -1531,6 +1531,7 @@ void  WebViewImpl::popupOpened(WebCore::PopupContainer* popupContainer)
     if (popupContainer->popupType() == WebCore::PopupContainer::Select) {
         ASSERT(!m_selectPopup);
         m_selectPopup = popupContainer;
+        m_rootLayer->setHaveWheelEventHandlers(true);
     }
 }
 
@@ -1539,6 +1540,7 @@ void  WebViewImpl::popupClosed(WebCore::PopupContainer* popupContainer)
     if (popupContainer->popupType() == WebCore::PopupContainer::Select) {
         ASSERT(m_selectPopup);
         m_selectPopup = 0;
+        m_rootLayer->setHaveWheelEventHandlers(false);

[jamesr, 2013/09/20 18:04:10]

what if the root layer actually had wheel event handlers before the popup
opened?  i think you need to save the bit off in popupOpened()

     }
 }