Fixing a number of dart:html analyzer issues

tools/dom/templates/html/impl/impl_Window.darttemplate

 // 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.
 
 part of $LIBRARYNAME;
 
 $if DART2JS
 $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS native "@*DOMWindow" {
 $else
 $(ANNOTATIONS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
@@ skipping 40 matching lines @@
    * Returns a Future that completes just before the window is about to repaint
    * so the user can draw an animation frame
    *
    * If you need to later cancel this animation, use [requestAnimationFrame]
    * instead.
    *
    * Note: The code that runs when the future completes should call
    * [animationFrame] again for the animation to continue.
    */
   Future<num> get animationFrame {
-    var completer = new Completer<int>();
-    requestAnimationFrame(completer.complete);
+    var completer = new Completer<num>();
+    requestAnimationFrame((time) {
+      completer.complete(time);
+    });
     return completer.future;
   }
 
 $if DART2JS
   Document get document => JS('Document', '#.document', this);
 
   WindowBase _open2(url, name) => JS('Window', '#.open(#,#)', this, url, name);
 
   WindowBase _open3(url, name, options) =>
       JS('Window', '#.open(#,#,#)', this, url, name, options);
@@ skipping 145 matching lines @@
   static bool get _supportsSetImmediate => false;
 
   /// Dartium stub for IE's setImmediate.
   void _setImmediate(void callback()) {
     throw new UnsupportedError('setImmediate is not supported');
   }
 $endif
 
 $!MEMBERS
 }