API: added function to find instance of template in prototype chain.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 87e71031c7c3055972447afc9c5bdc517b0deb8a..83d5bedce2df6780bcf27053a111fa63e2515089 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -1099,6 +1099,12 @@ class V8EXPORT Object : public Value {
   Local<Value> GetPrototype();
 
   /**
+   * Finds an instance of the given function template in the prototype
+   * chain.
+   */
+  Local<Object> FindInstanceInPrototypeChain(Handle<FunctionTemplate> tmpl);
+
+  /**
    * Call builtin Object.prototype.toString on this object.
    * This is different from Value::ToString() that may call
    * user-defined toString function. This one does not.