Implement elementsFromPoint

Source/web/WebPluginContainerImpl.cpp

Index: Source/web/WebPluginContainerImpl.cpp
diff --git a/Source/web/WebPluginContainerImpl.cpp b/Source/web/WebPluginContainerImpl.cpp
index 4d0a677b996012523bd3f3f07d2d9603928110d2..8f298c2e81befe0245cdbc68a237110c5bd404cc 100644
--- a/Source/web/WebPluginContainerImpl.cpp
+++ b/Source/web/WebPluginContainerImpl.cpp
@@ -510,8 +510,8 @@ bool WebPluginContainerImpl::isRectTopmost(const WebRect& rect)
     LayoutPoint center = documentRect.center();
     // Make the rect we're checking (the point surrounded by padding rects) contained inside the requested rect. (Note that -1/2 is 0.)
     LayoutSize padding((documentRect.width() - 1) / 2, (documentRect.height() - 1) / 2);
-    HitTestResult result = frame->eventHandler().hitTestResultAtPoint(center, HitTestRequest::ReadOnly | HitTestRequest::Active, padding);
-    const HitTestResult::NodeSet& nodes = result.rectBasedTestResult();
+    HitTestResult result = frame->eventHandler().hitTestResultAtPoint(center, HitTestRequest::ReadOnly | HitTestRequest::Active | HitTestRequest::ListBased, padding);
+    const HitTestResult::NodeSet& nodes = result.listBasedTestResult();
     if (nodes.size() != 1)
         return false;
     return nodes.first().get() == m_element;