DevTools: add "Jump to Relayout Boundary" context menu item in Elements panel

Source/devtools/front_end/DOMAgent.js

Index: Source/devtools/front_end/DOMAgent.js
diff --git a/Source/devtools/front_end/DOMAgent.js b/Source/devtools/front_end/DOMAgent.js
index 3f948b9ce6eb7103d79cd119924fcc4fc391067d..ea4f259153befe7e8be0e4e47bf7de7fe2f620c8 100644
--- a/Source/devtools/front_end/DOMAgent.js
+++ b/Source/devtools/front_end/DOMAgent.js
@@ -604,6 +604,14 @@ WebInspector.DOMNode.prototype = {
     },
 
     /**
+     * @param {function(?Protocol.Error, DOMAgent.NodeId=)} callback
+     */
+    findRelayoutBoundary: function(callback)
+    {
+        DOMAgent.relayoutBoundaryForNode(this.id, callback);
+    },
+
+    /**
      * @return {boolean}
      */
     isXMLNode: function()