Adding annotations for native types of type Object or dynamic.

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 9c9645af31d2d4642b031e922f513f4322cd52c4..fab888ef7f64765e7da3416c75b87dd215a6af43 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -6018,6 +6018,7 @@ class CustomEvent extends Event native "CustomEvent" {
 
   @DomName('CustomEvent.detail')
   @DocsEditable
+  @Creates('Null')
   final Object detail;
 
   @JSName('initCustomEvent')
@@ -10285,6 +10286,7 @@ class File extends Blob native "File" {
   @JSName('lastModifiedDate')
   @DomName('File.lastModifiedDate')
   @DocsEditable
+  @Creates('Null')
   final dynamic _get_lastModifiedDate;
 
   @DomName('File.name')
@@ -10854,6 +10856,7 @@ class FocusEvent extends UIEvent native "FocusEvent" {
   @JSName('relatedTarget')
   @DomName('FocusEvent.relatedTarget')
   @DocsEditable
+  @Creates('Null')
   final dynamic _get_relatedTarget;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
@@ -12810,6 +12813,7 @@ class InputElement extends Element implements
   @JSName('valueAsDate')
   @DomName('HTMLInputElement.valueAsDate')
   @DocsEditable
+  @Creates('Null')
   final dynamic _get_valueAsDate;
 
   void set valueAsDate(DateTime value) {
@@ -13836,11 +13840,6 @@ class Location implements LocationBase native "Location" {
   @DocsEditable
   String toString() native;
 
-  @DomName('Location.valueOf')
-  @DocsEditable
-  @Experimental // nonstandard
-  Object valueOf() native;
-
 
   @DomName('Location.origin')
   String get origin {
@@ -15270,6 +15269,7 @@ class Metadata native "Metadata" {
   @JSName('modificationTime')
   @DomName('Metadata.modificationTime')
   @DocsEditable
+  @Creates('Null')
   final dynamic _get_modificationTime;
 
   @DomName('Metadata.size')
@@ -19049,6 +19049,7 @@ class RtcStatsReport native "RTCStatsReport" {
   @JSName('timestamp')
   @DomName('RTCStatsReport.timestamp')
   @DocsEditable
+  @Creates('Null')
   final dynamic _get_timestamp;
 
   @DomName('RTCStatsReport.type')
@@ -22090,6 +22091,7 @@ class TrackEvent extends Event native "TrackEvent" {
 
   @DomName('TrackEvent.track')
   @DocsEditable
+  @Creates('Null')
   final Object track;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
@@ -23637,6 +23639,7 @@ class Window extends EventTarget implements WindowBase native "Window,DOMWindow"
 
   @DomName('Window.showModalDialog')
   @DocsEditable
+  @Creates('Null')
   Object showModalDialog(String url, [Object dialogArgs, String featureArgs]) native;
 
   @DomName('Window.stop')