Fix the inspector and integrate it with skydb

sky/framework/inspector/dom-agent.sky

 <script>
 function DOMAgent(delegate) {
   this.enabled = false;
   this.delegate_ = delegate;
   this.nextNodeId_ = 1;
   this.nodeToId_ = new Map();
   this.idToNode_ = new Map();
 }
 
 DOMAgent.prototype.getIdForNode_ = function(node) {
@@ skipping 42 matching lines @@
     record.localName = node.tagName;
     record.nodeValue = "";
     record.attributes = this.serializeAttributes_(node);
   } else if (node instanceof Text) {
     record.nodeType = 3;
     record.nodeName = "#text";
     var nodeValue = node.data;
     if (!nodeValue.trim())
       return null;
     record.nodeValue = nodeValue;
-  } else if (node instanceof Comment) {
-    record.nodeType = 8;
-    record.nodeName = "#comment";
-    record.nodeValue = node.data;
   } else if (node instanceof Document) {
     isContainer = true;
     record.nodeType = 9;
     record.nodeName = "#document";
     record.localName = "";
     record.nodeValue = "";
     record.documentURL = node.URL;
     record.baseURL = node.baseURI;
   } else if (node instanceof DocumentFragment) {
     isContainer = true;
@@ skipping 83 matching lines @@
           previousNodeId: previousNodeId,
           node: this.serializeNode_(node),
         });
       }.bind(this));
     }
   }
 };
 
 this.exports = DOMAgent;
 </script>