Change HtmlCollection to appear as List<Node> and getElementsByX return ListNode|HtmlCollection (de…

tools/dom/scripts/dartmetadata.py

Index: tools/dom/scripts/dartmetadata.py
diff --git a/tools/dom/scripts/dartmetadata.py b/tools/dom/scripts/dartmetadata.py
index fee093ecdce7fecc715689b1f837dd5cad518d4e..a86424fa098766f35e89b3fd2a76976354873a26 100644
--- a/tools/dom/scripts/dartmetadata.py
+++ b/tools/dom/scripts/dartmetadata.py
@@ -68,6 +68,16 @@ _dart2js_annotations = monitored.Dict('dartmetadata._dart2js_annotations', {
       "@Returns('Window|=Object|Null')",
     ],
 
+    'Document.getElementsByTagName': [
+      "@Creates('NodeList|HtmlCollection')",
+      "@Returns('NodeList|HtmlCollection')",
+    ],
+
+    'Document.getElementsByClassName': [
+      "@Creates('NodeList|HtmlCollection')",
+      "@Returns('NodeList|HtmlCollection')",
+    ],
+
     # Methods returning Window can return a local window, or a cross-frame
     # window (=Object) that needs wrapping.
     'Window': [
@@ -88,6 +98,16 @@ _dart2js_annotations = monitored.Dict('dartmetadata._dart2js_annotations', {
       "@Returns('JSExtendableArray')",
     ],
 
+    'Element.getElementsByTagName': [
+      "@Creates('NodeList|HtmlCollection')",
+      "@Returns('NodeList|HtmlCollection')",
+    ],
+
+    'Element.getElementsByClassName': [
+      "@Creates('NodeList|HtmlCollection')",
+      "@Returns('NodeList|HtmlCollection')",
+    ],
+
     "ErrorEvent.error": [
       "@Creates('Null')", # Only returns values created elsewhere.
     ],
@@ -255,6 +275,16 @@ _dart2js_annotations = monitored.Dict('dartmetadata._dart2js_annotations', {
       "@annotation_Returns_SerializedScriptValue",
     ],
 
+    'ShadowRoot.getElementsByTagName': [
+      "@Creates('NodeList|HtmlCollection')",
+      "@Returns('NodeList|HtmlCollection')",
+    ],
+
+    'ShadowRoot.getElementsByClassName': [
+      "@Creates('NodeList|HtmlCollection')",
+      "@Returns('NodeList|HtmlCollection')",
+    ],
+
     'SQLResultSetRowList.item': ["@Creates('=Object')"],
 
     # Touch targets are Elements in a Document, or the Document.