Tighter native type annotations for some elements returning Lists

tools/dom/scripts/dartmetadata.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality to provide Dart metadata for
 DOM APIs.
 """
 
 import copy
@@ skipping 65 matching lines @@
     ],
 
     'Window.openDatabase': [
       "@Creates('SqlDatabase')",
     ],
 
     'Window.showModalDialog': [
       "@Creates('Null')",
     ],
 
+    'Element.webkitGetRegionFlowRanges': [
+      "@Creates('JSExtendableArray')",
+      "@Returns('JSExtendableArray')",
+    ],
+
     "ErrorEvent.error": [
       "@Creates('Null')", # Only returns values created elsewhere.
     ],
 
     # To be in callback with the browser-created Event, we had to have called
     # addEventListener on the target, so we avoid
     'Event.currentTarget': [
       "@Creates('Null')",
       "@Returns('EventTarget|=Object')",
     ],
@@ skipping 99 matching lines @@
     'IDBVersionChangeEvent.newVersion': [
       "@Creates('int|String|Null')",
       "@Returns('int|String|Null')",
     ],
 
     'IDBVersionChangeEvent.oldVersion': [
       "@Creates('int|String|Null')",
       "@Returns('int|String|Null')",
     ],
 
+    'MediaStream.getAudioTracks': [
+      "@Creates('JSExtendableArray')",
+      "@Returns('JSExtendableArray')",
+    ],
+
+    'MediaStream.getVideoTracks': [
+      "@Creates('JSExtendableArray')",
+      "@Returns('JSExtendableArray')",
+    ],
+
     'MessageEvent.data': [
       "@annotation_Creates_SerializedScriptValue",
       "@annotation_Returns_SerializedScriptValue",
     ],
 
     'MessageEvent.ports': ["@Creates('JSExtendableArray')"],
 
     'MessageEvent.source': [
       "@Creates('Null')",
       "@Returns('EventTarget|=Object')",
@@ skipping 545 matching lines @@
       pass
     else:
       _logger.warn('Unknown support_level - %s:%s' % (interface_id, member_id))
 
     return annotations
 
   def Flush(self):
     json_file = open(self._api_status_path, 'w+')
     json.dump(self._types, json_file, indent=2, separators=(',', ': '), sort_keys=True)
     json_file.close()