dart:html perf optimization based on runing Dromaeo benchmarks

samples/third_party/dromaeo/tests/dom-query-htmlidiomatic.dart

Index: samples/third_party/dromaeo/tests/dom-query-htmlidiomatic.dart
diff --git a/samples/third_party/dromaeo/tests/dom-query-html.dart b/samples/third_party/dromaeo/tests/dom-query-htmlidiomatic.dart
similarity index 71%
copy from samples/third_party/dromaeo/tests/dom-query-html.dart
copy to samples/third_party/dromaeo/tests/dom-query-htmlidiomatic.dart
index 8e590ecd7e663fb26f8e48a1c434a4be7f55215e..0a657dbfc5cbe95f2ad707004d7a27c8fd98d1c1 100644
--- a/samples/third_party/dromaeo/tests/dom-query-html.dart
+++ b/samples/third_party/dromaeo/tests/dom-query-htmlidiomatic.dart
@@ -30,12 +30,12 @@ void main() {
     })
     .test('getElementById', () {
       for (int i = 0; i < num * 30; i++) {
-        ret = document.query('#testA$num').hidden;
-        ret = document.query('#testB$num').hidden;
-        ret = document.query('#testC$num').hidden;
-        ret = document.query('#testD$num').hidden;
-        ret = document.query('#testE$num').hidden;
-        ret = document.query('#testF$num').hidden;
+        ret = document.query('#testA$num').$dom_nodeType;
+        ret = document.query('#testB$num').$dom_nodeType;
+        ret = document.query('#testC$num').$dom_nodeType;
+        ret = document.query('#testD$num').$dom_nodeType;
+        ret = document.query('#testE$num').$dom_nodeType;
+        ret = document.query('#testF$num').$dom_nodeType;
       }
     })
     .test('getElementById (not in document)', () {
@@ -50,44 +50,44 @@ void main() {
     })
     .test('getElementsByTagName(div)', () {
       for (int i = 0; i < num; i++) {
-        var elems = document.queryAll('div');
-        ret = elems.last().hidden;
+        final elems = document.queryAll('div');
+        ret = elems.last().$dom_nodeType;
       }
     })
     .test('getElementsByTagName(p)', () {
       for (int i = 0; i < num; i++) {
         final elems = document.queryAll('p');
-        ret = elems.last().hidden;
+        ret = elems.last().$dom_nodeType;
       }
     })
     .test('getElementsByTagName(a)', () {
       for (int i = 0; i < num; i++) {
-        var elems = document.queryAll('a');
-        ret = elems.last().hidden;
+        final elems = document.queryAll('a');
+        ret = elems.last().$dom_nodeType;
       }
     })
     .test('getElementsByTagName(*)', () {
       for (int i = 0; i < num; i++) {
-        var elems = document.queryAll('*');
-        ret = elems.last().hidden;
+        final elems = document.queryAll('*');
+        ret = elems.last().$dom_nodeType;
       }
     })
     .test('getElementsByTagName (not in document)', () {
       for (int i = 0; i < num; i++) {
-        var elems = document.queryAll('strong');
-        ret = elems.length == 0;
+        final elems = document.queryAll('strong');
+        ret = elems.last().$dom_nodeType;
       }
     })
     .test('getElementsByName', () {
       for (int i = 0; i < num * 20; i++) {
-        var elems = document.queryAll('[name="test$num"]');
-        ret = elems.last().hidden;
+        ElementList elems = document.queryAll('[name="test$num"]');
+        ret = elems.last().$dom_nodeType;
         elems = document.queryAll('[name="test$num"]');
-        ret = elems.last().hidden;
+        ret = elems.last().$dom_nodeType;
         elems = document.queryAll('[name="test$num"]');
-        ret = elems.last().hidden;
+        ret = elems.last().$dom_nodeType;
         elems = document.queryAll('[name="test$num"]');
-        ret = elems.last().hidden;
+        ret = elems.last().$dom_nodeType;
       }
     })
     .test('getElementsByName (not in document)', () {