Support an Event Path API

Source/core/dom/Node.cpp

Index: Source/core/dom/Node.cpp
diff --git a/Source/core/dom/Node.cpp b/Source/core/dom/Node.cpp
index 1e80af0f00a8650f570082ee40da17996e303b16..a2c11241a9708062dde5d6fe584661a739741454 100644
--- a/Source/core/dom/Node.cpp
+++ b/Source/core/dom/Node.cpp
@@ -2779,6 +2779,17 @@ void Node::setIsCustomElement()
     setFlag(IsCustomElement);
 }
 
+bool Node::canReach(const Node* target) const

[dglazkov, 2013/05/08 16:37:29]

I think we can use the new fancy stuff in DOM spec to craft a better name here:
http://dom.spec.whatwg.org/#concept-tree-host-including-inclusive-ancestor

+{
+    ASSERT(target);
+    TreeScope* targetScope = target->treeScope();
+    for (TreeScope* scope = treeScope(); scope; scope = scope->parentTreeScope()) {
+        if (scope == targetScope)
+            return true;
+    }
+    return false;
+}
+
 } // namespace WebCore
 
 #ifndef NDEBUG