Add hit testing mode which ignores pointer-events:none.

Source/WebCore/rendering/RootInlineBox.cpp

Index: Source/WebCore/rendering/RootInlineBox.cpp
===================================================================
--- Source/WebCore/rendering/RootInlineBox.cpp	(revision 148175)
+++ Source/WebCore/rendering/RootInlineBox.cpp	(working copy)
@@ -178,7 +178,7 @@
 
 bool RootInlineBox::nodeAtPoint(const HitTestRequest& request, HitTestResult& result, const HitTestLocation& locationInContainer, const LayoutPoint& accumulatedOffset, LayoutUnit lineTop, LayoutUnit lineBottom)
 {
-    if (hasEllipsisBox() && visibleToHitTesting()) {
+    if (hasEllipsisBox() && visibleToHitTestRequest(request)) {
         if (ellipsisBox()->nodeAtPoint(request, result, locationInContainer, accumulatedOffset, lineTop, lineBottom)) {
             renderer()->updateHitTestResult(result, locationInContainer.point() - toLayoutSize(accumulatedOffset));
             return true;